1.删除字符串中重复的字符 2.删除字符串中指定的字符串 3.删除数组中重复元素

#include<stdio.h>
#include<string.h>
void del_1(char s[]) //删除重复字符
{
int i, j, k;
for(i=0; s[i] != '\0'; i++)
for(j=i+1; s[j] != '\0'; )
if(s[i] == s[j])
{
for(k=j; s[k] != '\0'; k++)
s[k] = s[k+1];
}
else
j++;
printf("\nDelete duplicate the string of the characters\n\n");
puts(s);
}

void del_2(char s1[])//删除指定字符串
{
char a[20];
int i, j, k, n;
printf("\nplease input a string your want to delete \n\n");
gets(a);
n = strlen(a);
for(i=0; s1[i] != '\0'; )
{
for(k=i, j=0; s1[k] == a[j] && s1[k] != '\0' && a[j] != '\0';  k++, j++);
if(k-i==n)
{

for(k=i; s1[k] != '\0'; k++)

s1[k] = s1[k+n];

}
else
i++;
}
printf("\nAfter delete the appoint string output new string\n\n");
puts(s1);
}

int main()
{
char s[100], s1[100];
printf("\nPlease input a string\n\n");
gets(s);
del_1(s);

printf("\nPlease input a string\n\n");
gets(s1);
del_2(s1);

return 0;
}

#include<stdio.h> //删除数组中的重复元素
void del(int a[], int n)
{
int i, j, k;
for(i=0; i<n; i++)
{
for(j=i+1; j<n; )
if(a[i] == a[j])
{
for(k=j; k<n-1; k++)
a[k] = a[k+1];
n--;
}
else
j++;
}

printf("\n");
for(i=0; i<n; i++)
printf("%d ",a[i]);

}
int main()
{
int a[100];
int n, i;
printf("Input the numbers of array: ");
scanf("%d", &n);

printf("\nPlease input %d numbers\n", n);
for(i=0; i<n; i++)
scanf("%d", &a[i]);
del(a, n);
}