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concatenation in c++


#include<iostream>
#include<string.h>
using namespace std;

int main()
{

char str1[100];
char str2[100];
cin>>str1;
cin>>str2;
int i, j;


for(i=0; str1[i] != '\0'; i++);

for(j=0; str2[j] != '\0'; j++,i++)
{
str1[i]=str2[j];
}

str1[i]='\0';

cout<<str1<<endl;

return 0;
}

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