Question:Swapping of strings using c programming language 

Answer 
#include<stdio.h>
int main(){
  int i=0,j=0,k=0;
  char str1[20],str2[20],temp[20];
  puts("Enter first string");
  gets(str1);
  puts("Enter second string");
  gets(str2);
  printf("Before swaping the strings are\n");
  puts(str1);
  puts(str2);
  while(str1[i]!='\0'){
             temp[j++]=str1[i++];
  }
  temp[j]='\0';
  i=0,j=0;
  while(str2[i]!='\0'){
              str1[j++]=str2[i++];
  }
  str1[j]='\0';
  i=0,j=0;
  while(temp[i]!='\0'){
              str2[j++]=temp[i++];
  }
  str2[j]='\0';
  printf("After swaping the strings are\n");
  puts(str1);
  puts(str2);
  return 0;
}
 

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