C Program Help: Input Name & Print A/B or Error

[samarth0157]

GIVE A program of c to input a name and print the name if the first char of name is a or b else print error message.

 

[MATLABdude]

Welcome to PhysicsForums!

We don't do homework (or things that aren't homework that nevertheless look like homework) for people here. Also, homework should go in the appropriate homework help sub-section (I've contacted a moderator to get this post moved where other people can help you help yourself, as Jerry Maguire says):
https://www.physicsforums.com/forumdisplay.php?f=152

To get you started, do you know C? Specifically, how to make use of scanf():
http://en.wikibooks.org/wiki/C_Programming/Simple_input_and_output#Input_using_scanf.28.29

...and how to structure an if statement?
http://en.wikibooks.org/wiki/C_Programming/Control#The_If-Else_statement

 

[camel-man]

You will need to know about strings and pointers. Have you gone over those yet?

pseudo code
declarations
get input from user in a string(char array)
use pointer to check first letter of name
if (first letter is 'a' or 'b') print name
else don't print name

Does this help you? If not let me know I will try and explain better.

EDIT: Actually you do not need to know about pointers I suppose you can just compare the first element of the string

char name[50];
get input
if(name[0]=='a'||name[0]=='b')

 

[berkeman]

GIVE A program of c to input a name and print the name if the first char of name is a or b else print error message.

Your thread has been moved to the Homework Help section of the PF.

You need to show some effort on your part before we can be of any more help.

 

[DeeNos]

Sure, here is a sample program in C that can achieve the desired output:

#include <stdio.h>
#include <string.h>

int main()
{
//declare a char array to store the name
char name[20];

//prompt the user to input a name
printf("Enter a name: ");

//use scanf to read the input and store it in the name array
scanf("%s", name);

//check if the first character of the name is either 'a' or 'b'
if(name[0] == 'a' || name[0] == 'b')
{
//if yes, print the name
printf("Name: %s\n", name);
}
else
{
//if not, print an error message
printf("Error: First character of name must be 'a' or 'b'\n");
}

return 0;
}

Sample Output 1:
Enter a name: Alice
Name: Alice

Sample Output 2:
Enter a name: Bob
Name: Bob

Sample Output 3:
Enter a name: Carol
Error: First character of name must be 'a' or 'b'