解决问题：
    错误C4996'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

#define _CRT_SECURE_NO_WARNINGS 1

将上方代码放置在第一行(不放置在第一行不生效)

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main() {
    int a = 0;
    int b = 0;
    int sum = 0；
    scanf("%d %d",&a ,&b);
    sum = a + b;
    printf("sum = %d\n", sum);
    return 0;
}