Question

How to return function pointer from a function in C

Answer 1

#include <stdio.h>

enum Math
{
  ADD = '+',
  SUB = '-',
  MUL = '*',
};


int add(int a, int b)
{
    return a + b;
}

int sub(int a, int b)
{
    return a - b;
}

int mul(int a, int b)
{
    return a * b;
}

int (*function(enum Math mt))(int, int)
{
    switch (mt)
    {
        case ADD:
            return &add;
        case SUB:
            return &sub;        
        case MUL:
            return &mul;
        default:
            return NULL;
    }
}

int main(void)
{
    int (*fp)(int, int);

    fp = function(ADD);
    int a = 13, b = 5;
    int result = (*fp)(a, b);
    printf("%d + %d = %d\n", a, b, result);
    
    
    fp = function(MUL);
    result = (*fp)(a, b);
    printf("%d * %d = %d\n", a, b, result);
    
    return 0;
}

    
/*
run:

13 + 5 = 18
13 * 5 = 65
   
*/

 

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