Beginner in C programming

[Nguyen]

#include <stdio.h>

int main() {

int age =25;

printf("%d", age);

return 0;
}
This is my code why do I need this :%, inside

 

[VBService]

The part you're asking about: %d, is a format specifier used by printf.

What does "%d" do?​

• The printf function in C is used to print output to the screen.
• The %d inside the double quotes tells printf to: "Insert an integer value here".
• The d stands for "decimal" (i.e., a base-10 number).

Specifier	Meaning	Example
%d	Integer (decimal)	printf("%d", 10);
%f	Floating point (decimal)	printf("%f", 3.14);
%c	Single character	printf("%c", 'A');
%s	String (text)	printf("%s", "Hi");

 

[VBService]

BTW,

Online C code example that works

#include <stdio.h>

int main() {

  int variable_1 = 10;
  float variable_2 = 10.20;
 
  printf("d");
  printf("\n");
 
  printf("%d", variable_1);
  printf("\n");
 
  printf("%d d", variable_1);
  printf("\n");
 
  printf("%d d - %f f", variable_1, variable_2);
  printf("\n");
 
  printf("Lorem ipsum %d. Lorem ipsum %f. Lorem ipsum %.2f.", variable_1, variable_2, variable_2);

  return 0;
}

 

[Ezhil Anna]

#include <stdio.h>

int main() {

int variable_1 = 10;
float variable_2 = 10.20;
char variable_3[] = "Tamizh";
char variable_4 = 'M';

printf("d");
printf("\n");

printf("%c Initial", variable_4);
printf("\n");

printf("%s Greetings", variable_3);
printf("\n");

printf("%d", variable_1);
printf("\n");

printf("%d d", variable_1);
printf("\n");

printf("%d d - %f f", variable_1, variable_2);
printf("\n");

printf("Lorem ipsum %d. Lorem ipsum %f. Lorem ipsum %.2f.", variable_1, variable_2, variable_2);

return 0;
}