C编程-如何将输出图片文件设置为.pgm格式？

Question

我需要程序自动将其创建为 out1.pgm，而不是要求用户输入输出名称。我该怎么办？

       {
        printf("Enter image filename: ");
        scanf("%s", fileName);

        img = readpic(fileName);

        printf("Successfully read image file '%s'\n", fileName);
        printf("Adjust brightness: ");
        scanf("%d", &brightness);

        option1(img, brightness);

        printf("Enter image filename for output: ");
        scanf("%s", fileName);

        writeoutpic(fileName,img);



        free(img);
        img = NULL;
        return(EXIT_SUCCESS);
    }

Answer 1

将 scanf("%s", fileName); 更改为 strcpy(fileName, "out1.pgm");