单选题
在下列代码的横线处填写( ),可以使得输出是 GESP IS INTERESTING 。
int main(){\tstring str="gEsP is Interesting";\tint x = str.length();\tfor(int i = 0; i < x; i )\t\tif ((str[i]>='a') && (str[i]<='z'))\t\t\t________________________;\tcout << str << endl;\tcout << endl;\treturn 0;}
A.
str[i] ='a'-'A'
B.
str[i] =20
C.
str[i] ='A'-'a'
D.
无法实现
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