C：实验E4-1，转换大小写

GitHenry

#include <stdio.h>
int main()
{
    char ch[10];
    printf("input 10 letters:");
    for (int i = 0; i <= 9; i++)
    {
        ch[i] = getchar();
    }
    printf("your input letter:");
    for (int i = 0; i <= 9;i++)
    {
        printf("%c", ch[i]);
    }
    printf("\nyour input letters'Caps are:");
    for (int i = 0; i <= 9; i++)
    {
        if (ch[i] >= 'a' && ch[i] <= 'z')
        {
            ch[i] -= 32;
            putchar(ch[i]);
        }
        else if(ch[i] >= 'A' && ch[i] <= 'Z')
        {
            putchar(ch[i]);
        }
        else
        {
            printf("your input text is not a letter!\n");
        }
    }
    return 0;
}