Question

What is the difference between strlen() and sizeof() string in C

Answer 1

#include <stdio.h>
#include <string.h>

int main(int argc, char **argv)
{ 
	char s[] = "C Programming"; 
	
    printf ("%d\n", (int)sizeof(s)); // 13 + null = 14
    printf ("%d\n", (int)strlen(s)); // 13
	
	return 0; 
}   
 

/*
run:
 
14
13
 
*/

 

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Answer 2

#include <stdio.h>
#include <string.h>

int main(int argc, char **argv)
{ 
	char s[30] = "C Programming"; 
	
    printf ("%d\n", (int)sizeof(s)); // 30
    printf ("%d\n", (int)strlen(s)); // 13
	
	return 0; 
}   
 

/*
run:
 
30
13
 
*/

 

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