tesla-1i/c-program

c or cpp

c-program's Issues

/打印1到n的阶乘

#include <stdio.h>//打印1到n的阶乘
#define size 10

int fact(int n)//打印n的阶乘，
{
if (n>0)//函数递归
{
return n*fact(n-1);
}
else
return 1;
}
int calnumber(int nums[],int n)
{
int i;
if (n>0 && n<size+1)
{
for ( i = 0; i < n; ++i)
{
nums[i]=fact(i+1);//调用fact 函数，将阶乘存在数组中
}
return 1;
}
else
return 0;
}
int main(int argc, char const *argv[])
{
int nums[size];
int i,n;
scanf("%d",&n);
if(!calnumber(nums,n))
{
printf("illegal number!\n");
return 1;
}
else
{
for ( i = 0; i < n; ++i)
{
printf("%d\n",nums[i] );
}
}
return 0;
}

十进制转化二进制

//十进制数转换成二进制数输出
#include <stdio.h>

void d2b(unsigned int n)
{
if (n==0 || n==1)
{
putchar('\n');
}
else

{
	d2b(n/2);//除以二
	printf("%d\n",n%2 );//除以二取余
}

}
int main()
{
int n;
printf("input number:\n");
scanf("%d",&n);
d2b(n);
return 0;
}

fibonaci数列前n项

//编程输出fibonaci数列前n项
#include <stdio.h>

void fib(int n,int i,int i1,int i2)
{
if (i==2)
{
printf("1,\t1");
}
if (i<n)
{
printf(",\t%d",i1+i2 );
fib(n,i+1,i1+i2,i1);

}
else
	printf("\n");

}
int main(int argc, char const *argv[])
{
int n;
printf("input numner:\n");
scanf("%d",&n);
fib(n,2,1,1);
return 0;
}

用递归方法，求数组元素的加和

#include <stdio.h>//#include <stdio.h>用递归方法，求数组元素的加和

int sum(int nums[],int n)
{
int sum2;
if(n>1)
sum2 = nums[n-1]+sum(nums,n-1);//n-1号值加到sum2,
else
sum2 = nums[0];
return sum2;
}
int main()
{
int nums[3]={1,2,3};
int sum1;
sum1 = sum(nums,3);//3指的是个数，不是标号！！！！！！！！
printf("%d\n",sum1 );
return 0;
}

int sum(int nums[],int n)
{
int sum2;
if(n>1)
sum2 = nums[n-1]+sum(nums,n-1);//n-1号值加到sum2,
else
sum2 = nums[0];
return sum2;
}
int main()
{
int nums[3]={1,2,3};
int sum1;
sum1 = sum(nums,3);//3指的是个数，不是标号！！！！！！！！
printf("%d\n",sum1 );
return 0;
}