function pointer

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

int32_t(*fncPtr)(int32_t, int32_t);

int32_t fncA(int32_t x, int32_t y)
{
    return x + y;
}

int32_t fncB(int32_t x, int32_t y)
{
    return x - y;
}


int main (int argc, char **argv){

    int32_t a = 2;
    int32_t b = 1;
    int32_t r;

    //int32_t(*fncPtr)(int32_t, int32_t) = &fncA;

    fncPtr = &fncA;

    r=(*fncPtr)(a,b);

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

    fncPtr = &fncB;

    r=(*fncPtr)(a,b);

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

return 0;
}

/*
output:

3
1

*/