68. WRITE A C PROGRAM TO CONCATENATE TWO STRINGS WITHOUT USING LIBRARY FUNCTION

/*C program to concatenate two strings without using library function*/

#include<stdio.h>
#include<conio.h>
void main()
{
char a[10],b[10],c[40];
int i,j;
clrscr();
printf("\n\nENTER FIRST STRING:");
gets(a);
printf("\n\nENTER SECOND STRING:");
gets(b);
for(i=0;a[i]!='\0';i++)
c[i]=a[i];
for(j=0;a[j]!='\0';j++)
{
c[i]=b[j];
i++;
}
c[i]='\0';
printf("\n\nTHE COMBINED STRING IS:");
puts(c);
getch();
}

output

ENTER FIRST STRING:KUCET
ENTER SECOND STRING:_IT
THE COMBINED STRING IS:KUCET_IT

/*C program to compare two strings without using library functions*/

#include<stdio.h>
int stringCompare(char[],char[]);
int main(){
char str1[100],str2[100];
int compare;
printf("Enter first string: ");
scanf(str1);
printf("Enter second string: ");
scanf("%s",str2);
compare = stringCompare(str1,str2);
if(compare == 1)
printf("Both strings are equal.");
else
printf("Both strings are not equal");
return 0;
}

output

Enter first string: c_programming
Enter second string: c_programming
Both strings are equal.