1 输入三个整数 x,y,z，把这三个数由小到大输出
# include void main(){ int x,y,z,a; scanf ("%d,%d,%d",&x,&y,&z);if(x>y) {a=x; x=y;y=a;} if(x>z) { a=x; x=z; z=a; } if(y>z) {a=y; y=z; z=a; }printf("%d,%d,%d\n",x,y,z);} 2 输入圆的半径，输出圆的周长和面积
# include # define PI 3
1415926# define S ==PI*r*r# define V (4
0/3)*PI*r*r*r void main() { double r; printf("please input r:"); scanf("%lf",&r); printf("area is %
4lf\n",S); printf("volume is %
4lf\n",V); }输入正方形的边长，输出正方形的周长和面积
# includevoid main(){ float c,zc,mj;printf("输入你的正方形");scanf("%f\n",&c); zc=4*c;mj=c*c;printf("周长%f，面积%f，边长%f",zc,mj,c);}3 用格式输入函数输入 3 个字符，并用输出函数反向输出 3 个字符和他们的ASCII 码
# includeint main(){char-ch1,ch2,ch3;printf("please input three characters:\n");scanf("%C%C%c",&ch1,&ch2,&ch3);printf("%c\n%d\n",ch3,ch3);printf("%c\n%d\n",ch2,ch2);printf("%c\n%d\n",ch1,ch1)
