C语言程序设计闰年算法,求几个简单c语言程序设计

1 判断闰年

void main()

{

int year;

printf("please input a year: ");

scanf("%d",&year);

if((year%4==0&&year%100!=0)||(year%400==0))

printf("The year: %d is RunNian!\n",year);

else

printf("The year: %d isn't RunNian!\n",year);

}

2 输出图形

void main()

{

int i,j;

for(i=0;i

void main()

{

long num;

int n[7],place,i,flag;

printf("请输入一个整数(0 ~ 999999):");

scanf("%ld",&num);

if(num>99999)

place=6;

else if(num>9999)

place=5;

else if(num>999)

place=4;

else if(num>99)

place=3;

else if(num>9)

place=2

else place=1;

printf("位数:%d\n",place);

n[6]=mun/10000

n[5]=num/10000;

n[4]=(int)(num-n[5]*10000)/1000;

n[3]=(int)(num-n[5]*10000-n[4]*1000)/100;

n[2]=(int)(num-n[5]*10000-n[4]*1000-n[3]*100)/10;

n[1]=(int)(num-n[5]*10000-n[4]*1000-n[3]*100-n[2]*10);

printf("反序数字为：");

5 连接字符串

char str1[100];

char str2[100];

void Strcat(str1,str2)

char *str1,*str2;

{

int len;

int i=0;

len=strlen(str1);

while(*(str2+i))

{

*(str1+i+len)=*(str2+i);

i++;

}

}

int main()

{

scanf("%s",&str1);

scanf("%s",&str2);

Strcat(&str1,&str2);

printf("%s",str1);

getchar();

getchar();

}

6 判断素数

void main()

{ int m,i,k;

printf("please input a number:\n");

scanf("%d",&m);

k=sqrt(m);

for(i=2;i=k)

printf("该数是素数");

else

printf("该数不是素数");

}

另外一个慢慢考虑中……。

全部