题目内容

The writer has learned from the writing of the three “thank you” letters that one should write to family members and teachers frequently.

A. 对
B. 错

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判断char型变量ch是否为大写字母的正确表达式是。

A. ch>=’A’||ch<=’Z’
B. ch>=’A’&&ch<=’Z’
C. ’A’= D. ch>=A&&ch<=Z

满足字符变量ch是回车或者数字的C语言表达式是。

A. ch== ' \n'|| '0' =< ch<= '9'
B. ch== ' \n'&&ch>= '0' && ch<= '9'
C. ch== ' \n'|| ch>= '0' && ch<= '9'
D. ch== ' \n'|| ch>= '0' ||ch<= '9'

函数表示仅输出一个字符。

程序补充题:输入圆的半径，求圆的周长和面积，请选择正确的语句序号填写在空白处补充以下程序，完成上述功能。# define PI 3.14/定义符号常量PI，其值为3.14/int main(void){float r,l,s;;/输入圆的半径/l=2PIr; /求周长/;/求面积/printf("半径为%f,周长=%f,面积=%f", r,l,s);return 0;}a. # include b.# include c. scanf("%lf", &r)d.scanf("%f", &r)e. s=PI**r*rf.s=π**r*r