C Program to implement newStringCopy and newStringConcatenate functions

Source: Dr. G T Raju, Professor & Head, Dept. of CSE, RNSIT

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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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