#includeint main(){int I=2;//赋值使I不为零while(I)//当括号内表达式不为零时实现后面的循环{charb;scanf("%c",&b);if(b>='A'&&b<='Z'){b=b+32;printf("%c",b);}elseif(b>='a'&&b<='z'){b=b-32;printf("%c",b);}}return0;}扩展资料C语言:将字符串中所有小写字母转为大写字母#include#include#include#defineN100int main(){chara[N];inti;scanf("%s",a);for(i=0;a[i]!='