C语言scanf的返回值EOF

int scanf(const char *format, ...);

#include <stdio.h>

int main() {
    int a, b;
    printf("Enter two integers: ");
    int result = scanf("%d %d", &a, &b);
    if (result == 2) {
        printf("You entered: a = %d, b = %d\n", a, b);
    } else {
        printf("Invalid input or EOF encountered.\n");
    }
    return 0;
}

#include <stdio.h>

int main() {
    int a, b;
    printf("Enter two integers: ");
    while (1) {
        int result = scanf("%d %d", &a, &b);
        if (result == 2) {
            printf("You entered: a = %d, b = %d\n", a, b);
            break;
        } else if (result == EOF) {
            printf("EOF encountered.\n");
            break;
        } else {
            printf("Invalid input. Please enter two integers.\n");
            // 清除输入缓冲区中的无效输入
            while (getchar() != '\n');
        }
    }
    return 0;
}