Feb 14, 2012

C Program to copy and concatenate strings without using standard functions.

C Program to copy and concatenate strings without using standard functions.
In this program , we copy one string from another, and without using the standard library function strcpy from string.h .
Here we appends the one string to another without using the strcat function. Read more about C Programming Language .


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#include <stdio.h>

void newStrCpy(char *,char *);
void newStrCat(char *,char *);

void main()
{
 char str1[80],str2[80];
 int opn;
 do
 {
   printf("Press 1- NewStrCpy \t 2- NewStrCat\t 3- Exit\t Your Option?");
   scanf("%d",&opn);
   switch(opn)
   {
    case 1: flushall();
     printf("\n Read the Source String \n");
     gets(str1);
     newStrCpy(str2,str1);
     printf(" Copied String: %s\n",str2);
     break;
    case 2: flushall();
     printf(" Read the First String \n");
     gets(str1);
     printf(" Read the Second String \n");
     gets(str2);
     newStrCat(str1,str2);
     printf("Concatenated String: \n");
     puts(str1);
     break;
    case 3: printf(" Exit!! Press a key . . .");
     getch();
     break;
    default: printf(" Invalid Option!!! Try again !!!\n");
     break;
     }
 }while(opn != 3);
}   /* End of main() */

void newStrCpy(char *d,char *s)
 {
  while( (*d++ = *s++));
 }
void newStrCat(char *s, char *t)
 {
  while(*s)
  s++;
  while(*s++ = *t++);
 }

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