int i, a, b, c, d;
        char e;
        printf("请输入一串字符\n");
        while ( ( e = getchar() ) != '\n' ) {
            if (e >= 'a' && e <= 'z' || e >= 'A' && e <= 'Z') {
                a++;
            } else if (e == ' ') {
                b++;
            } else if ( e >= '0' && e <= '9') {
                c++;
            } else {
                d++;
            }
            
        }
        printf("%d,%d,%d,%d", a,b,c,d);            //d的值有问题
问：d的值为啥不正常？

是的

谢谢大佬我果然还是新手

int i, a, b, c, d;
        for (i = 0; i < 3; i++) {
            a++;
            b++;
            c++;
            d++;
        }
        printf("%d\t,%d\t,%d\t,%d\t", a,b,c,d);
4       ,3      ,1708931        ,3
--------------------------------
Process exited after 0.361 seconds with return value 17
请按任意键继续. . .
这个为什么啊？