C语言编程简单示例

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1、1.”1”字三角形#includeintmain(){intn,i,j;printf("Enterthesideofthetriangle:");scanf("%d",&n);for(i=1;i<=n;i++){for(j=1;j<=n-i;j++)putchar('');for(j=1;j<=i;j++){putchar('1');if(j!=i)putchar('1');}putchar('');}return0;}2.N的阶乘#includeintmain(){inti=1,n;doublej=1;printf("请输入N:");s

2、canf("%d",&n);while(i<=n){j=i*j;i++;}printf("%lf",j);}3.计算e的方法（1）#includeintmain(){inti=1,n;doublej=1;printf("请输入N:");scanf("%d",&n);while(i<=n){j=i*j;i++;}printf("%lf",j);}（2）#includeintmain(){floata,i=1,j=1,e=1;printf("请输入精度p=");scanf("%f",&a);do{j*=i;e+=(1/j);i++;}wh

3、ile((1/i)>a);printf("e=%.16f",e);return0;}1.九九乘法表#includeintmain(){intm=0,n=0;for(m=1;m<=9;m++){for(n=1;n<=m;n++)printf("%2d*%d=%2d",n,m,n*m);printf("");}return0;}2.判断月的天数#includeintmain(){inta,b,c,d,year;printf("请输入年份:");scanf("%d",&year);printf("请输入月份:");scanf("%d",&a

4、);if(a<1&&a>13)printf("输入错误!!!");else{switch(a){case4:case6:case9:case11:printf("本月有30天");break;case2:if(year%4!=0

5、

6、year%100==0&&year%400!=0)printf("本月有28天");elseprintf("本月有29天");break;default:printf("本月有31天");}}}1.显示系统时间#include#include#includeintmain(){str

7、ucttm*date;time_tcurr;curr=time(NULL);date=localtime(&curr);printf("%d/%d/%d%d:%d:%d",date->tm_year+1900,date->tm_mon+1,date->tm_mday,date->tm_hour,date->tm_min,date->tm_sec);getchar();}2.素数（1）#include#includechara,b,c,d;intt;intxx(intd){for(a='a';a<=d;a++){for(t=1;t<=d-

8、a;t++)printf("");for(b='a';b<=a;b++)printf("%c",b);for(c=a-1;c>='a';c--)printf("%c",c);printf("");}returnd;}intdx(intd){for(a='A';a<=d;a++){for(t=1;t<=d-a;t++)printf("");for(b='A';b<=a;b++)printf("%c",b);for(c=a-1;c>='A';c--)printf("%c",c);printf("");}returnd;}intmain(){while(1){chara,b,

9、c,d,p;intt;title:printf("请输入一个字母:");scanf("%c",&d);if(d<='z'&&d>='a')xx(d);elseif(d<='Z'&&d>='A')dx(d);else{printf("输入错误!!请按Enter键继续...");getchar();getchar();system("cls");gototitle;}printf("是否继续（y/n）");getchar();scanf("%c",&p);system("cls");if(p