请问这个程序怎么改啊？报错说func没有返回值

Question

#include<stdio.h>
int func(int x){
    x--;
    printf("x=%d\n", x);
}

    int main(){
        int num;
        printf("Input a number:");
        scanf("%d", &num);


    func(num);
    printf("num=%d\n", num);
    return 0;
}

Answer 1

供参考：

#include<stdio.h>
int func(int x){
    x--;
    printf("x=%d\n", x);
    return x;            //修改 增加返回语句
}

int main(){
    int num;
    printf("Input a number:");
    scanf("%d", &num);

    func(num);
    printf("func(num):num=%d\n", num);

    num = func(num);   //修改
    printf("num = func(num):num=%d\n", num);

    return 0;
}