reguarding scientific notation

G

grinder

I have a program that fits a line to data points. The question is: can
'C' understand scientific notation (as below) , and if not what can i
do to make it work..


0.000 0.3231E+02 0.0000E+00 0.00 0.5642E+02
13.191 0.3421E+02 0.0000E+00 10.00 0.5910E+02

26.248 0.2842E+02 0.0000E+00 20.00 0.4758E+02

39.047 0.2325E+02 0.0000E+00 30.00 0.3701E+02

51.485 0.1790E+02 0.0000E+00 40.00 0.2664E+02

63.483 0.1313E+02 0.0000E+00 50.00 0.1803E+02

74.987 0.9572E+01 0.0000E+00 60.00 0.1201E+02

85.971 0.7565E+01 0.0000E+00 70.00 0.8609E+01

96.431 0.7118E+01 0.0000E+00 80.00 0.7326E+01

106.379 0.8017E+01 0.0000E+00 90.00 0.7463E+01

115.846 0.9925E+01 0.0000E+00 100.00 0.8379E+01

124.870 0.1246E+02 0.0000E+00 110.00 0.9596E+01

133.498 0.1528E+02 0.0000E+00 120.00 0.1081E+02

141.781 0.1809E+02 0.0000E+00 130.00 0.1187E+02

149.775 0.2064E+02 0.0000E+00 140.00 0.1272E+02

157.536 0.2277E+02 0.0000E+00 150.00 0.1334E+02

165.121 0.2437E+02 0.0000E+00 160.00 0.1376E+02

172.590 0.2536E+02 0.0000E+00 170.00 0.1399E+02

0.000 0.3240E+02 0.0000E+00 180.00 0.5658E+02


My data is primarily the last two columns.
I have written a script in AWK to strip columns 4 & 5, though i have
not tried to run this data file through my C program, i am fairly
confident that it will not understand the syntan.


Please help. praise the lord
 
K

Knemon

grinder said:
I have a program that fits a line to data points. The question is: can
'C' understand scientific notation (as below) , and if not what can i
do to make it work..


0.000 0.3231E+02 0.0000E+00 0.00 0.5642E+02
13.191 0.3421E+02 0.0000E+00 10.00 0.5910E+02

26.248 0.2842E+02 0.0000E+00 20.00 0.4758E+02

39.047 0.2325E+02 0.0000E+00 30.00 0.3701E+02

51.485 0.1790E+02 0.0000E+00 40.00 0.2664E+02

63.483 0.1313E+02 0.0000E+00 50.00 0.1803E+02

74.987 0.9572E+01 0.0000E+00 60.00 0.1201E+02

85.971 0.7565E+01 0.0000E+00 70.00 0.8609E+01

96.431 0.7118E+01 0.0000E+00 80.00 0.7326E+01

106.379 0.8017E+01 0.0000E+00 90.00 0.7463E+01

115.846 0.9925E+01 0.0000E+00 100.00 0.8379E+01

124.870 0.1246E+02 0.0000E+00 110.00 0.9596E+01

133.498 0.1528E+02 0.0000E+00 120.00 0.1081E+02

141.781 0.1809E+02 0.0000E+00 130.00 0.1187E+02

149.775 0.2064E+02 0.0000E+00 140.00 0.1272E+02

157.536 0.2277E+02 0.0000E+00 150.00 0.1334E+02

165.121 0.2437E+02 0.0000E+00 160.00 0.1376E+02

172.590 0.2536E+02 0.0000E+00 170.00 0.1399E+02

0.000 0.3240E+02 0.0000E+00 180.00 0.5658E+02


My data is primarily the last two columns.
I have written a script in AWK to strip columns 4 & 5, though i have
not tried to run this data file through my C program, i am fairly
confident that it will not understand the syntan.
Click to expand...

#include <stdio.h>

int main(void)
{
char input[] = "0.000 0.3231E+02 0.0000E+00 0.00 0.5642E+02\n"
"13.191 0.3421E+02 0.0000E+00 10.00 0.5910E+02\n"
"26.248 0.2842E+02 0.0000E+00 20.00 0.4758E+02\n"
"39.047 0.2325E+02 0.0000E+00 30.00 0.3701E+02\n"
"51.485 0.1790E+02 0.0000E+00 40.00 0.2664E+02\n"
"63.483 0.1313E+02 0.0000E+00 50.00 0.1803E+02\n"
"74.987 0.9572E+01 0.0000E+00 60.00 0.1201E+02\n"
"85.971 0.7565E+01 0.0000E+00 70.00 0.8609E+01\n"
"96.431 0.7118E+01 0.0000E+00 80.00 0.7326E+01\n"
"106.379 0.8017E+01 0.0000E+00 90.00 0.7463E+01\n"
"115.846 0.9925E+01 0.0000E+00 100.00 0.8379E+01\n"
"124.870 0.1246E+02 0.0000E+00 110.00 0.9596E+01\n"
"133.498 0.1528E+02 0.0000E+00 120.00 0.1081E+02\n"
"141.781 0.1809E+02 0.0000E+00 130.00 0.1187E+02\n"
"149.775 0.2064E+02 0.0000E+00 140.00 0.1272E+02\n"
"157.536 0.2277E+02 0.0000E+00 150.00 0.1334E+02\n"
"165.121 0.2437E+02 0.0000E+00 160.00 0.1376E+02\n"
"172.590 0.2536E+02 0.0000E+00 170.00 0.1399E+02\n"
"0.000 0.3240E+02 0.0000E+00 180.00 0.5658E+02\n", *p;
double x[5];
int n = 0;
printf("The input stream contains:\n%s\n", input);
for (p = input;; p += n) {
if (sscanf(p, "%lg%lg%lg%lg%lg%n",
&x[0], &x[1], &x[2], &x[3], &x[4], &n) != 5)
break;
printf
("After %d more characters, the x array contains\n"
"%g %E %E %g %E\n\n", n, x[0], x[1], x[2], x[3], x[4]);
}
return 0;
}


The input stream contains:
0.000 0.3231E+02 0.0000E+00 0.00 0.5642E+02
13.191 0.3421E+02 0.0000E+00 10.00 0.5910E+02
26.248 0.2842E+02 0.0000E+00 20.00 0.4758E+02
39.047 0.2325E+02 0.0000E+00 30.00 0.3701E+02
51.485 0.1790E+02 0.0000E+00 40.00 0.2664E+02
63.483 0.1313E+02 0.0000E+00 50.00 0.1803E+02
74.987 0.9572E+01 0.0000E+00 60.00 0.1201E+02
85.971 0.7565E+01 0.0000E+00 70.00 0.8609E+01
96.431 0.7118E+01 0.0000E+00 80.00 0.7326E+01
106.379 0.8017E+01 0.0000E+00 90.00 0.7463E+01
115.846 0.9925E+01 0.0000E+00 100.00 0.8379E+01
124.870 0.1246E+02 0.0000E+00 110.00 0.9596E+01
133.498 0.1528E+02 0.0000E+00 120.00 0.1081E+02
141.781 0.1809E+02 0.0000E+00 130.00 0.1187E+02
149.775 0.2064E+02 0.0000E+00 140.00 0.1272E+02
157.536 0.2277E+02 0.0000E+00 150.00 0.1334E+02
165.121 0.2437E+02 0.0000E+00 160.00 0.1376E+02
172.590 0.2536E+02 0.0000E+00 170.00 0.1399E+02
0.000 0.3240E+02 0.0000E+00 180.00 0.5658E+02

After 49 more characters, the x array contains
0 3.231000E+01 0.000000E+00 0 5.642000E+01

After 51 more characters, the x array contains
13.191 3.421000E+01 0.000000E+00 10 5.910000E+01

After 51 more characters, the x array contains
26.248 2.842000E+01 0.000000E+00 20 4.758000E+01

After 51 more characters, the x array contains
39.047 2.325000E+01 0.000000E+00 30 3.701000E+01

After 51 more characters, the x array contains
51.485 1.790000E+01 0.000000E+00 40 2.664000E+01

After 51 more characters, the x array contains
63.483 1.313000E+01 0.000000E+00 50 1.803000E+01

After 51 more characters, the x array contains
74.987 9.572000E+00 0.000000E+00 60 1.201000E+01

After 51 more characters, the x array contains
85.971 7.565000E+00 0.000000E+00 70 8.609000E+00

After 51 more characters, the x array contains
96.431 7.118000E+00 0.000000E+00 80 7.326000E+00

After 52 more characters, the x array contains
106.379 8.017000E+00 0.000000E+00 90 7.463000E+00

After 52 more characters, the x array contains
115.846 9.925000E+00 0.000000E+00 100 8.379000E+00

After 52 more characters, the x array contains
124.87 1.246000E+01 0.000000E+00 110 9.596000E+00

After 52 more characters, the x array contains
133.498 1.528000E+01 0.000000E+00 120 1.081000E+01

After 52 more characters, the x array contains
141.781 1.809000E+01 0.000000E+00 130 1.187000E+01

After 52 more characters, the x array contains
149.775 2.064000E+01 0.000000E+00 140 1.272000E+01

After 52 more characters, the x array contains
157.536 2.277000E+01 0.000000E+00 150 1.334000E+01

After 52 more characters, the x array contains
165.121 2.437000E+01 0.000000E+00 160 1.376000E+01

After 52 more characters, the x array contains
172.59 2.536000E+01 0.000000E+00 170 1.399000E+01

After 50 more characters, the x array contains
0 3.240000E+01 0.000000E+00 180 5.658000E+01
 
V

visitmani

hey knemon,

when i compile it in gcc and try to execute it , it says
permission denied . Doesn't mean the code is accessing any unknown
address , it should throw SEGV or else what can be the problem ??
grinder said:
I have a program that fits a line to data points. The question is: can
'C' understand scientific notation (as below) , and if not what can i
do to make it work..


0.000 0.3231E+02 0.0000E+00 0.00 0.5642E+02
13.191 0.3421E+02 0.0000E+00 10.00 0.5910E+02

26.248 0.2842E+02 0.0000E+00 20.00 0.4758E+02

39.047 0.2325E+02 0.0000E+00 30.00 0.3701E+02

51.485 0.1790E+02 0.0000E+00 40.00 0.2664E+02

63.483 0.1313E+02 0.0000E+00 50.00 0.1803E+02

74.987 0.9572E+01 0.0000E+00 60.00 0.1201E+02

85.971 0.7565E+01 0.0000E+00 70.00 0.8609E+01

96.431 0.7118E+01 0.0000E+00 80.00 0.7326E+01

106.379 0.8017E+01 0.0000E+00 90.00 0.7463E+01

115.846 0.9925E+01 0.0000E+00 100.00 0.8379E+01

124.870 0.1246E+02 0.0000E+00 110.00 0.9596E+01

133.498 0.1528E+02 0.0000E+00 120.00 0.1081E+02

141.781 0.1809E+02 0.0000E+00 130.00 0.1187E+02

149.775 0.2064E+02 0.0000E+00 140.00 0.1272E+02

157.536 0.2277E+02 0.0000E+00 150.00 0.1334E+02

165.121 0.2437E+02 0.0000E+00 160.00 0.1376E+02

172.590 0.2536E+02 0.0000E+00 170.00 0.1399E+02

0.000 0.3240E+02 0.0000E+00 180.00 0.5658E+02


My data is primarily the last two columns.
I have written a script in AWK to strip columns 4 & 5, though i have
not tried to run this data file through my C program, i am fairly
confident that it will not understand the syntan.
Click to expand...

#include <stdio.h>

int main(void)
{
char input[] = "0.000 0.3231E+02 0.0000E+00 0.00 0.5642E+02\n"
"13.191 0.3421E+02 0.0000E+00 10.00 0.5910E+02\n"
"26.248 0.2842E+02 0.0000E+00 20.00 0.4758E+02\n"
"39.047 0.2325E+02 0.0000E+00 30.00 0.3701E+02\n"
"51.485 0.1790E+02 0.0000E+00 40.00 0.2664E+02\n"
"63.483 0.1313E+02 0.0000E+00 50.00 0.1803E+02\n"
"74.987 0.9572E+01 0.0000E+00 60.00 0.1201E+02\n"
"85.971 0.7565E+01 0.0000E+00 70.00 0.8609E+01\n"
"96.431 0.7118E+01 0.0000E+00 80.00 0.7326E+01\n"
"106.379 0.8017E+01 0.0000E+00 90.00 0.7463E+01\n"
"115.846 0.9925E+01 0.0000E+00 100.00 0.8379E+01\n"
"124.870 0.1246E+02 0.0000E+00 110.00 0.9596E+01\n"
"133.498 0.1528E+02 0.0000E+00 120.00 0.1081E+02\n"
"141.781 0.1809E+02 0.0000E+00 130.00 0.1187E+02\n"
"149.775 0.2064E+02 0.0000E+00 140.00 0.1272E+02\n"
"157.536 0.2277E+02 0.0000E+00 150.00 0.1334E+02\n"
"165.121 0.2437E+02 0.0000E+00 160.00 0.1376E+02\n"
"172.590 0.2536E+02 0.0000E+00 170.00 0.1399E+02\n"
"0.000 0.3240E+02 0.0000E+00 180.00 0.5658E+02\n", *p;
double x[5];
int n = 0;
printf("The input stream contains:\n%s\n", input);
for (p = input;; p += n) {
if (sscanf(p, "%lg%lg%lg%lg%lg%n",
&x[0], &x[1], &x[2], &x[3], &x[4], &n) != 5)
break;
printf
("After %d more characters, the x array contains\n"
"%g %E %E %g %E\n\n", n, x[0], x[1], x[2], x[3], x[4]);
}
return 0;
}


The input stream contains:
0.000 0.3231E+02 0.0000E+00 0.00 0.5642E+02
13.191 0.3421E+02 0.0000E+00 10.00 0.5910E+02
26.248 0.2842E+02 0.0000E+00 20.00 0.4758E+02
39.047 0.2325E+02 0.0000E+00 30.00 0.3701E+02
51.485 0.1790E+02 0.0000E+00 40.00 0.2664E+02
63.483 0.1313E+02 0.0000E+00 50.00 0.1803E+02
74.987 0.9572E+01 0.0000E+00 60.00 0.1201E+02
85.971 0.7565E+01 0.0000E+00 70.00 0.8609E+01
96.431 0.7118E+01 0.0000E+00 80.00 0.7326E+01
106.379 0.8017E+01 0.0000E+00 90.00 0.7463E+01
115.846 0.9925E+01 0.0000E+00 100.00 0.8379E+01
124.870 0.1246E+02 0.0000E+00 110.00 0.9596E+01
133.498 0.1528E+02 0.0000E+00 120.00 0.1081E+02
141.781 0.1809E+02 0.0000E+00 130.00 0.1187E+02
149.775 0.2064E+02 0.0000E+00 140.00 0.1272E+02
157.536 0.2277E+02 0.0000E+00 150.00 0.1334E+02
165.121 0.2437E+02 0.0000E+00 160.00 0.1376E+02
172.590 0.2536E+02 0.0000E+00 170.00 0.1399E+02
0.000 0.3240E+02 0.0000E+00 180.00 0.5658E+02

After 49 more characters, the x array contains
0 3.231000E+01 0.000000E+00 0 5.642000E+01

After 51 more characters, the x array contains
13.191 3.421000E+01 0.000000E+00 10 5.910000E+01

After 51 more characters, the x array contains
26.248 2.842000E+01 0.000000E+00 20 4.758000E+01

After 51 more characters, the x array contains
39.047 2.325000E+01 0.000000E+00 30 3.701000E+01

After 51 more characters, the x array contains
51.485 1.790000E+01 0.000000E+00 40 2.664000E+01

After 51 more characters, the x array contains
63.483 1.313000E+01 0.000000E+00 50 1.803000E+01

After 51 more characters, the x array contains
74.987 9.572000E+00 0.000000E+00 60 1.201000E+01

After 51 more characters, the x array contains
85.971 7.565000E+00 0.000000E+00 70 8.609000E+00

After 51 more characters, the x array contains
96.431 7.118000E+00 0.000000E+00 80 7.326000E+00

After 52 more characters, the x array contains
106.379 8.017000E+00 0.000000E+00 90 7.463000E+00

After 52 more characters, the x array contains
115.846 9.925000E+00 0.000000E+00 100 8.379000E+00

After 52 more characters, the x array contains
124.87 1.246000E+01 0.000000E+00 110 9.596000E+00

After 52 more characters, the x array contains
133.498 1.528000E+01 0.000000E+00 120 1.081000E+01

After 52 more characters, the x array contains
141.781 1.809000E+01 0.000000E+00 130 1.187000E+01

After 52 more characters, the x array contains
149.775 2.064000E+01 0.000000E+00 140 1.272000E+01

After 52 more characters, the x array contains
157.536 2.277000E+01 0.000000E+00 150 1.334000E+01

After 52 more characters, the x array contains
165.121 2.437000E+01 0.000000E+00 160 1.376000E+01

After 52 more characters, the x array contains
172.59 2.536000E+01 0.000000E+00 170 1.399000E+01

After 50 more characters, the x array contains
0 3.240000E+01 0.000000E+00 180 5.658000E+01
Click to expand...
 
J

jmcgill

hey knemon,

when i compile it in gcc and try to execute it , it says
permission denied . Doesn't mean the code is accessing any unknown
address , it should throw SEGV or else what can be the problem ??
Click to expand...

You shell is saying "permission denied", I assume because the output
file from your compiler is not executable for some reason.

The program itself doesn't have any IO that would be likely to lead
to that message. The memory usage looks healthy, so SEGV isn't likely
either.

After saving the message and trimming it:

$ gcc -o ./message ./message.c
$ chmod 0755 ./message # should not be necessary
$ ./message

.... works ...
 
G

grinder

so i am to understand that i do not have to change the scientific
notation at all, and that C will understand the current syntax (in
reguards to the last column).
 
B

Ben Pfaff

grinder said:
so i am to understand that i do not have to change the scientific
notation at all, and that C will understand the current syntax (in
reguards to the last column).
Click to expand...

Yes, C understands syntax like "0.5642E+02" as scientific notation.
 
K

Knemon

hey knemon,

when i compile it in gcc and try to execute it , it says
permission denied . Doesn't mean the code is accessing any unknown
address , it should throw SEGV or else what can be the problem ??
Click to expand...

You are invoking either the compiler or the program incorrectly.
 

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