Question

用两种循环语句输出26个大写及小写字母

Answer 1

for(int ascii = 97;ascii<123;ascii++){
putchar(ascii);//A-Z
putchar(10);//换行
putchar(ascii-32);//a-z
}

for(char c = 'A';c<='Z';c++){
putchar(c);//A-Z
putchar(10);//换行
putchar(ascii+32);//a-z
}

Answer 2

char c;

for(c='A';c<='Z';c++) putchar(c);

c='A';
while(c<='Z')
{
putchar(c);
putchar(c+32);
}