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//program to input two strings(char array) and concatenate them using for loop (concatenate means to join the strings) #include<conio.h> #include<stdio.h> #include<string.h> void main() { char str1[20],str2[20],str3[40]; int i,j,l,k; clrscr(); printf("\nenter string 1"); gets(str1); printf("\nenter string 2"); gets(str2); l=strlen(str1); k=strlen(str2); for(i=0;i<l;i++) { str3[i]=str1[i]; } for(i=0,j=l;j<k+l;i++,j++) { str3[j]=str2[i]; } str3[k+l]='\0'; printf("\nconcatnated string is %s",str3); getch(); }