C语言输入输出和简单程序编写

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 int main(){
 4     printf(" 0 \n");
 5     printf("<H>\n");
 6     printf("I I\n");
 7     printf(" 0 \n");
 8     printf("<H>\n");
 9     printf("I I\n");
10     system("pause");
11     return 0;
12 }

1 #include<stdio.h>
2 #include<stdlib.h>
3 int main(){
4     printf(" 0        0\n");
5     printf("<H>      <H>\n");
6     printf("I I      I I\n");
7     system("pause");
8     return 0;
9 }

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 int main(){
 4     float a, b, c;
 5     scanf("%f%f%f",&a,&b,&c);
 6     if(a+b>c&&a+c>b&&b+c>a){
 7         printf("能构成三角形");
 8     }
 9     else{
10         printf("不能构成三角形");
11     }
12     system("pause");
13     return 0;
14 }

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 int main(){
 4     char ans1,ans2;
 5     printf("每次课前认真预习，课后及时复习了没？（输入Y或y表示有，输入n或N表示没有）：");
 6     ans1 = getchar();//由于回车键也是一种字符，此行代码为了取到正确输入结果，防止回车键干扰运行结果
 7     getchar();
 8     printf("\n动手敲代码实践了没？（输入y或Y表示敲了，输入n或N表示没有敲）：");
 9     ans2 = getchar();
10     if((ans1 == 'y'||ans1 =='Y')&&(ans2 == 'y'||ans2 == 'Y')) {
11         printf("\n罗马不是一天建成的，继续保持哦！\n");
12     }
13     else{
14         printf("罗马不是一天毁灭的，我们来建设吧!\n");
15     }
16     system("pause");
17     return 0;
18 }

 1 #include<stdio.h>
 2 int main(){
 3     double x, y;
 4     char c1, c2, c3;
 5     int a1, a2, a3;
 6     scanf("%d%d%d",&a1,&a2,&a3);/*少了&字符，不能获取到输入的数字*/ 
 7     printf("a1 = %d,a2 = %d,a3 = %d\n",a1,a2,a3);
 8     scanf("%c%c%c",&c1,&c2,&c3);
 9     printf("c1 = %c,c2 = %c,c3 = %c\n",c1,c2,c3);
10     scanf("%lf,%lf",&x,&y);/*f是单精度浮点型，而lf才是双精度浮点型与上文double对应*/ 
11     printf("x = %lf,y = %lf\n",x,y);
12     return 0;
13     
14 }

 1 #include<stdio.h>
 2 int main(){
 3     int year;
 4     double c = 10.0*10*10*10*10*10*10*10*10/60/60/24/365;
 5     int b = c;
 6     double a = c-b;
 7     if(a>=0&&a<0.5){
 8         year = b;
 9     }
10     else {
11         year = b+1;
12     }
13     printf("10亿秒约等于%d年\n",year);
14     return 0;
15 }

#include<stdio.h>
#include<math.h>
int main(){
    double x,ans;
    while(scanf("%lf",&x)!=EOF){
    ans = pow(x,365);
    printf("%.2f的365次方： %.2f\n",x,ans);
}
    return 0;
}

1 #include<stdio.h>
2 int main(){
3     double c,f;
4     while(scanf("%lf",&c)!=EOF){
5         f = c*9.0/5+32;
6         printf("摄氏度c = %.2lf时，华氏度f = %.2lf\n",c,f);
7     }
8     return 0;
9 }

 1 #include<stdio.h>
 2 #include<math.h>
 3 int main(){
 4     int a,b,c;
 5     double s,area;
 6     while(scanf("%d %d %d",&a,&b,&c) != EOF){
 7         s = (a+b+c)/2.0;
 8         area = sqrt(s*(s-a)*(s-b)*(s-c));
 9         printf("a = %d,b = %d,c = %d,area = %.3lf\n",a,b,c,area);    
10     }
11 }