#包含?& ltstdio.h & gt
int main()
{
char ch
Printf("請輸入壹個字符:");
scanf("%c ",& ampch);
if(ch & gt;= ' A ' & amp& ampch & lt='Z ')
ch = ch+32;
else if(ch & gt;= ' a ' & amp& ampch & lt='z ')
ch = ch-32;
Printf("已更改字符:%c\n ",ch);
返回0;
}