Question

How to convert hexadecimal string to integer in C

Answer 1

#include <stdio.h>

int main()
{
    char s[] = "FFFA0E1D";
    
    int n;
    sscanf(s, "%x", &n);
    
    printf("%u\n", n);
}
 
/*

run:

4294577693

*/

 

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Answer 2

#include <stdio.h>
#include <stdlib.h>

int main()
{
    char hex[] = "0x1AF0";
   
    int n = strtol(hex, 0, 16);
    
    printf("%d\n", n);
}
 
/*

run:

6869

*/

 

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Answer 3

#include <stdio.h>
#include <stdlib.h>

int main()
{
    char hex[] = "0x1AFD";
   
    int n = strtoul(hex, 0, 16);
    
    printf("%d\n", n);
}
 
/*

run:

6909

*/

 

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