接收和返回函数指针的函数指针的类型？

typedef 返回值类型 (*函数指针名称)(参数类型1, 参数类型2, ...);

#include <stdio.h>

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

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

typedef int (*FuncPtr)(int, int);

int operate(FuncPtr func, int a, int b) {
    return func(a, b);
}

FuncPtr getOperation(char op) {
    if (op == '+') {
        return add;
    } else if (op == '-') {
        return subtract;
    } else {
        return NULL;
    }
}

int main() {
    char operator = '+';
    FuncPtr operation = getOperation(operator);
    
    if (operation != NULL) {
        int result = operate(operation, 5, 3);
        printf("Result: %d\n", result);
    } else {
        printf("Invalid operator\n");
    }
    
    return 0;
}