Simple problem?

[Shel Sherman]

What's wrong with this code? Using Gcc in Fedora 4 it gives the wrong value
for x unless it is declared a float.

#include <stdio.h>
int main{
char * estr = "1.234";
double x = 0;
sscanf(estr, "%g", &x);
printf("%g", x);
return 0;
}

typical result is x = -0.0140015.

Thanks,
Shel Sherman

 

[Ben Pfaff]

double x = 0;
sscanf(estr, "%g", &x);

Use the "l" flag with the scanf functions to read doubles.

 

[Martin Ambuhl]

What's wrong with this code? Using Gcc in Fedora 4 it gives the wrong value
for x unless it is declared a float.

#include <stdio.h>
int main{
char * estr = "1.234";
double x = 0;
sscanf(estr, "%g", &x);
printf("%g", x);
return 0;
}

typical result is x = -0.0140015.

After fixing the three obvious errors in your code, yielding:

#include <stdio.h>
int main(void)
{ /* mha: fixed missing parameter list */
char *estr = "1.234";
double x = 0;
sscanf(estr, "%lg", &x); /* mha: fixed format specifier */
printf("%g\n", x); /* mha: added EOL character */
return 0;
}

I get as output:

1.234

 

[Shel Sherman]

Thanks all. That did the trick. Appreciate the help.

Shel

 

[CBFalconer]

Thanks all. That did the trick. Appreciate the help.

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