如何在c中从文本中读取整数int*

int fscanf(FILE *stream, const char *format, ...);

FILE *file = fopen("filename.txt", "r");
if (file == NULL) {
    // 文件打开失败的处理逻辑
}

int num;
if (fscanf(file, "%d", &num) != 1) {
    // 读取整数失败的处理逻辑
}

fclose(file);

#include <stdio.h>

int main() {
    FILE *file = fopen("filename.txt", "r");
    if (file == NULL) {
        printf("文件打开失败\n");
        return 1;
    }
    
    int num;
    if (fscanf(file, "%d", &num) != 1) {
        printf("读取整数失败\n");
        fclose(file);
        return 1;
    }
    
    printf("读取到的整数为：%d\n", num);
    
    fclose(file);
    return 0;
}