what is wrong in my code?

[sjcc]

#include <stdio.h>

//x is a global variable
int x;   //QUESTION A:

/**
The parseInt() function returns a 1 (one) if the C string parameter
num_str is formatted as a valid integer, otherwise the function
returns a 0 (zero).
*/
int parseInt(char num_str[])
{
    int i;   
    for (; num_str[i] != '\0'; i++)
        if( num_str[i] == '+' || num_str[i] == '-' )
	i++;
    for (num_str [i] == '\0')
            return 0;
    
    return 1;
}

    int i;   //QUESTION A:
    for (i = 0; num_str[i] != '\0'; i++)
        if( num_str[i] < '0' || num_str[i] > '9' )
            return 0;
    
    return 1;
}

int main() 
{
    char str[100];
    printf("Please enter a list of integers or EOF"
           " to finish (example: 897 8 -3 EOF).\n" );
    
    while ( 1 )
    {
        scanf( "%s", str );
        if ( feof(stdin) )
            break;
        
        printf( "%s is ", str );
        if ( !parseInt(str) )
            printf( "NOT " );
        printf( "is a valid integer.\n" );
    }

    return

[laserlight]

what is wrong in my code?

It won't compile.

Rather, you should tell us what is wrong with your code, and then ask specific help on how to fix it.

[stevesmithx]

Did you try compiling it?
If so, what errors do you get?
Sounds like "Remove the errors in the following code" kind of homework.

[BEN10]

ya, it seems as if this is a code found on the net and was asked to tell the errors if any.