Question

C program help

#include
#include
#include
void PrintName(char firstname[16], char lastname[16]);
int main ()
{ char firstname[16];
char lastname[16];
printf("please enter your first name:");
scanf("%s",firstname);
printf("please enter your last name:");
scanf("%s",lastname);
PrintName(firstname,lastname);
return 0;
}
void PrintName(char firstname[16], char lastname[16]){
char fullname[34];
*fullname=*firstname+*lastname;
(char*) malloc (sizeof (*fullname));
if (strlen(firstname) > 16||strlen(lastname)>16||strlen(fullname)>16)
fflush(stdin);
else
printf(" the full name is %s %s \n",firstname,lastname);
printf(" the full name is-> %s",fullname);/*why is one not run*/
return 0;
}

Answer 1

In C Program the operators can not be used for any string manipulation. You have to use certain library functions to achieve this or you have to use logics to achieve this.

So the error is with this statement

*fullname=*firstname+*lastname;

This can be replaced by

strcpy(fullname,firstname); //copy the first name to fullname
strcat(fullname," "); //concatnate a space with fullname
strcat(fullname,lastname);//concatnate the last name with full name

Secondly you are using pointers so before that you have to declare it,no doubt strings and pointer are closely interrelated but without declaration you cannot use the pointers like this.

Here is the rectified program

#include<stdio.h>
#include<string.h>
void PrintName(char firstname[16], char lastname[16]);
int main ()
{ char firstname[16];
char lastname[16];
printf("please enter your first name:");
scanf("%s",firstname);
printf("please enter your last name:");
scanf("%s",lastname);
PrintName(firstname,lastname);
return 0;
}
void PrintName(char firstname[16], char lastname[16]){
char fullname[34];
strcpy(fullname,firstname);
strcat(fullname," ");
strcat(fullname,lastname);
//*fullname=*firstname+*lastname;
//printf(" the full nameeeee is %s",fullname);
(char*) malloc (sizeof (*fullname)); //this code also not required
if (strlen(firstname) > 16||strlen(lastname)>16||strlen(fullname)>16)
fflush(stdin);
else
printf(" the full name is %s %s \n",firstname,lastname);
printf(" the full name is %s",fullname);
return 0;
}

OUTPUT