Programming

/*my first c script */

#include <stdio.h>

int main()
{
int num;

printf("Idjit enter a number:");
scanf("%d", &num);
while(num = "%d" && num > 0)
    {
    printf(" Your not an idjit. This is the number you entered %d\n",num);
    return(0);
    }
    if(num != "%d" && num = "%c")
    {
    printf("Idjit this a letter not a number %c\n",num);
    return(1);
    }
    else
    {
    printf("Give up. You are a true Idjit");
    return(1);
}

cli@user~/Documents/scripts/c-prog# gcc -o number number.c 
number.c: In function ‘main':
number.c:16:12: warning: comparison between pointer and integer [enabled by default]
number.c:16:27: error: lvalue required as left operand of assignment
number.c:25:1: error: expected declaration or statement at end of input

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

int main()
{
    char tmp[16]={0x0};  // read in strings it works better;
    int num=0;
    char *p;
    printf("Idjit enter a number:");
    fgets(tmp, sizeof(tmp), stdin);  // read tmp from keyboard
    //scanf("%d", &num);
    p=strchr(tmp, '\n');  // find the trailing newline character
    if(p!=NULL) *p=0x0;   // terminate the string on the \n character  
    num=atoi(tmp);    // we do not use this but here it is anyway
    if( isdigit(*tmp) )   // %d is a string, use the isdigit  
    {
        printf(" Your not an idjit. This is the number you entered %s\n",tmp);
        return(0);
    }
    if(!isdigit(*tmp) )  // it is not a digit
    {
       printf("Idjit this a letter not a number %s\n",tmp);  // you cannot print numbers that do not exist
       return(1);
    }
    else // you cannot get here from the above if() statement.
    {
       printf("Give up. You are a true Idjit");
       return(1);
    }
    
}

while(fgets(buf, 512, stdin) != NULL)
{
        int value;
        if(sscanf(buf, "%d", &value) == 1)
        {
                printf("You typed a number\n");
        }
        else
        {
                printf("You didn't type a number\n");
        }
}