步骤1
int main()
{
    char controll;
    char arr1[] = { "                              1.Input" };
    char arr2[] = { "                              2.Output" };
    char arr3[] = { "                              3.Order" };
    char arr4[] = { "                              4.Quit" };
    char arr5[] = { "You are trying to Input info" };
    char arr6[] = { "You are trying to Output info" };
    char arr7[] = { "You are trying to Make things ordered" };
    char arr8[] = { "You are about to Quit" };
    printf("%s\n%s\n%s\n%s\n", arr1, arr2, arr3, arr4);
    scanf_s("%c", &controll);
    switch (controll) {
    case 'i':printf("\n%s\n", arr5); break;
    case 'o':printf("\n%s\n", arr6); break;
    case 'm':printf("\n%s\n", arr7); break;
    case 'q':printf("\n%s\n", arr8); break;
        default:printf("Wrong input");
    }
   
}
步骤2
#include <iostream>

int main()
{
	struct student
	{
		int number;
		float gaoshu;
		float dawu;
		float yy;
		float add;
	}student1, student2, student3;
	scanf_s("%d%f%f%f", &student1.number, &student1.gaoshu, &student1.dawu, &student1.yy);
	scanf_s("%d%f%f%f", &student2.number, &student2.gaoshu, &student2.dawu, &student2.yy);
	scanf_s("%d%f%f%f", &student3.number, &student3.gaoshu, &student3.dawu, &student3.yy);
	student1.add = (student1.gaoshu + student1.dawu + student1.yy);
	student2.add = (student2.gaoshu + student2.dawu + student2.yy);
	student3.add = (student3.gaoshu + student3.dawu + student3.yy);
	printf("%d  %f  %f  %f  %f\n", student1.number, student1.gaoshu, student1.dawu, student1.yy, student1.add);

printf("%d  %f  %f  %f  %f\n", student2.number, student2.gaoshu, student2.dawu, student2.yy, student2.add);

printf("%d  %f  %f  %f  %f\n", student3.number, student3.gaoshu, student3.dawu, student3.yy, student3.add);
}