Question

How to subtract character in C

Answer 1

#include <stdio.h>

int main()
{
    char ch = '9';
    int n = ch - '1';
    
    printf("%c\n", ch);
    printf("%d\n", n);

    return 0;
}


          
/*
run:
       
9
8

*/

 

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Answer 2

#include <stdio.h>

int main()
{
    char ch = '9';
    int n = ch - 49; // '1' = 49
    
    printf("%c\n", ch);
    printf("%d\n", n);

    return 0;
}


          
/*
run:
       
9
8

*/

 

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