在字符串的指定位置添加另一个字符串:
/*****************************************************
copyright (C), 2014-2015, Jinling Institute of Tecnology
File name:2-5.c
Author: Zhang.Y.F Version:0.1 Date: 2018-07-23 20:45
Description:
Funcion List:
*****************************************************/
#include <stdio.h>
#include<string.h>
int main()
{
char s1[20],s2[20];int n;
printf("pelease input:\n");
scanf("%s",s1);
scanf("%d",&n);
scanf("%s",s2);
int lenth1;
lenth1 = strlen(s1);
int a,i,j;
char c[40];
int k;
for(i = 0;i <= n - 1; i++)
{
c[i] = s1[i];
}
for(j = 0;s2[j] != '\0';j++)
{
c[i+j] = s2[j];
}
for(k = n;s1[k] != '\0';k++)
{
c[j+k]=s1[k];
}
c[j + k]='\0';
printf("%s\n",c);
}
统计 1-n有多少个9:
#include <stdio.h>
int main()
{
int n;
printf("please input a num:\n");
scanf("%d",&n);
int i;
int count = 0;
for(i = 1;i <= n; i++)
{
int a;
a = i +1;
if(a % 10 == 0){
count = count + 1;
}
}
printf("%d\n",count);
return 0;
}
有n个人围成一圈,顺序排号,从第一个开始报数(从1到3报数),凡报到3的人退出圈子,问最后最后留下的是原来第几号的那位.
#include<stdio.h>
int main()
{
int n, count, i;
int cn = 0;
int p = 0;
int index = 0;
printf("please input :\n");
scanf("%d", &n);
int a[n];
count = n;//对非0计数
for(i = 0; i < n; ++i)
a[i] = i + 1;
while(1)
{
count = 0;
for(i = index - n * p; i < n; ++i)
{
if(a[i] != 0 )
{
count += 1;
cn += 1;
if(cn == 3)
{
cn = 0;
a[i] = 0;
}
}
index += 1;
}
p += 1;
if(count == 1) break;
}
for(i = 0; i < n; ++i)
{
if(a[i] != 0)
{
printf("%d\n",a[i]);
}
}
return 0;
}
一个数如果恰好等于它的因子之和,这个数被成为”完数”,例如:6=1+2+3.请编程找出1000以内的完数
/*****************************************************
copyright (C), 2014-2015, Jinling Institute of Tecnology
File name:t5.c
Author: Zhang.Y.F Version:0.1 Date: 2018-07-24 11:03
Description:
Funcion List:
*****************************************************/
#include <stdio.h>
int main()
{
int i= 0,j=0;
int count=0;
int tmp = 0;
for(i = 0;i <= 1000; ++i)
{
for(j = 1;j < i; ++j)
{
count = i % j;
if(count == 0)
{
tmp = tmp + j;
}
}
if(tmp == i)
{
printf("%d\n",i);
}
tmp = 0;
}
return 0;
}
在字符串中指定位置添加字符
#include<stdio.h>
#include<string.h>
int main()
{
char a[50];char b;int n;
printf("please input :");
scanf("%s",a);
scanf("%c",&b);
scanf("%d",&n);
int i, j = 0, k=0;
int length;
length = sizeof(a);
char c[50];
for(i = 0;i <= n - 1;i++,j++)
{
c[j] = a[i];
}
c[i+1] = b;
for(k = n;k <= length;k++)
{
c[k+1]=a[k];
}
printf("%s",c);
}
ps:这个有问题,但是 目前还没找出来。。。