一、编程题1
输入2个整数，求两数的平方和并输出
#includeintmain(void){intta,b,s;printf("pleaseinputa,b:\n");scanf("%d%d”,&a,&b);s=a*a+b*b;printf("theresultis%d\n",s);return0;}2
输入一个圆半径r，当r>＝0时，计算并输出圆的面积和周长，否则，输出提示信息
#include#definePI3
14intmain(void){doubler,area,girth;printf("pleaseinputr:\n");scanf("%lf",&r);if(r>=0){area=PI*r*r;girth=2*PI*r;printf("theareais%
2f\n",area);printf("thegirthis%
2f\n",girth);}elseprintf("Inputerror
\n");return0;}3、已知函数y=f(x)，编程实现输入一个x值，输出y值
2x+1(x0)#includevoidmain(){intx,y;scanf(“%d”,&x);if(x0)y=2*x-1;elsey=0;printf(“%d”,y);}4
从键盘上输入一个百分制成绩score，按下列原则输出其等级：score≥90，等级为A；80≤score
