Error detection

[ulti-killer]

How to design a function that can check name and number whether it is valid or not? If the name contains symbol and/or number while number contains alphabet and/or symbol, it will prompt the user to key in again the valid input.

[Salem]

A loop, and various calls to the likes of isdigit() et al in ctype.h

char buff[BUFSIZ];
while ( fgets( buff, BUFSIZ, stdin ) != NULL ) {
  if ( validate(buff) ) {
    // do your thing
  } else {
    // complain
  }
}

[ulti-killer]

Why it doesn't work? It shows 2 error about error C1075: end of file found before the left brace '{' and IntelliSense: argument of type "char *" is incompatible with parameter of type "int". The name variable in line 19 has red underline.

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

// Function main begins program execution
int main(void)
{
char name [50], *line;

    // Prompt and read the user's na5me
    printf("Name: ");
    // Remove newline
    line = strchr(name,'\n');
    *line = '\0';
    fflush(stdin);
    while ( fgets(name, sizeof(name), stdin ) != NULL ) 
    {
        if ( isalpha (name) )
        {
        printf("Name: %s", name);
        }
        else
        {
        printf("Enter name again");
        // Prompt and read the user's name
        printf("Name: ");
        // Remove newline
        line = strchr(name,'\n');
        *line = '\0';
        fflush(stdin);
        }

    system ("pause");
    }

[stahta01]

isalpha - C++ Reference

[Matticus]

fflush(stdin);

Why fflush(stdin) is wrong