With variables, we can calculate any expressions. For example, $$3+5=?\\c=a+b$$

/*
Desc: calculate c=a+b
Auth: Liutong Xu
*/

#include <stdio.h>
 
int main(void) 
{
    int a, b;
    int c;

    a = 5;
    b = 6;
    c = a + b;
    printf("%d + %d = %d\n", a, b, c);

    return 0;
}

stdout

5 + 6 = 11

Calculate $a+b$ with different $a$ and $b$

/*
Desc: calculate c=a+b 
Auth: Liutong Xu
*/

#include <stdio.h>
 
int main(void) 
{
    int a, b;
    int c;
 
    scanf("%d%d", &a, &b);
    c = a + b;
    printf("%d + %d = %d\n", a, b, c);
 
    return 0;
}

stdio

10 12

stdout

10 + 12 = 22

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