C Language Returning Function Pointers from a Function

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Example

#include <stdio.h>

enum Op
{
  ADD = '+',
  SUB = '-',
};


/* add: add a and b, return result */    
int add(int a, int b)
{
    return a + b;
}

/* sub: subtract b from a, return result */
int sub(int a, int b)
{
    return a - b;
}

/* getmath: return the appropriate math function */
int (*getmath(enum Op op))(int,int)
{
    switch (op)
    {
        case ADD:
            return &add;
        case SUB:
            return &sub;
        default:
            return NULL;
    }
}

int main(void)
{
    int a, b, c;
    int (*fp)(int,int);

    fp = getmath(ADD);

    a = 1, b = 2;
    c = (*fp)(a, b);
    printf("%d + %d = %d\n", a, b, c);
    return 0;
}
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