C語言，順序結構

void main()

{char c1,c2;

c1=getchar();

c2=getchar();

putchar(c1);

printf("%c",c2);}

2.#include<stdio.h>

void main()

{int r,h;

float s,v;

printf("請輸入圓的半徑：\n");

scanf("%d",&r);

printf("請輸入圓的高：\n");

scanf("%d",&h);

printf("圓的面積是：\n");

s=3.14*r*r;

printf("%3.2f\n",s);

printf("圓柱的體積：\n");

v=s*h;

printf("%3.2f\n",v);}

}