Write a C Program to Concat string

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/*Programmed by : Vivek Patel**********************************/
/*For Bugs Free feel to contact********************************/
/*Website : www.vivekpatel.cjb.net*****************************/
/*Email : vivek_patel9@rediffmail.com**************************/
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#include
#include
#include
void main(){
char str1[20],str2[20],str3[40]="";
int len,i,j;
clrscr();
printf("*****Strings Concatination Function*****\n\n");
printf("Enter string1: ");
scanf("%s",str1);
printf("Enter string2: ");
scanf("%s",str2);

for(i=0,j=0;str1[i]!='\0';i++,j++)
str3[j] = str1[i];

for(i=0;str2[i]!='\0';i++,j++)
str3[j] = str2[i];

str3[j] = '\0';
len = j;

printf("\n\nAfter Concatination : %s",str3);
printf("\n\nLength of concated string is %d",len);
getch();
}