Chapter-01

A Tutorial Introduction

File Name	Description
01.c
02.c
03.c
04.c
05.c
06.c
Exercise_1-3.c
Exercise_1-4.c
Exercise_1-5.c
Exercise_1-6.c
Exercise_1-7.c
Exercise_1-8.c
Exercise_1-9.c
Exercise_1-10.c
Exercise_1-11.c
Exercise_1-12.c
Exercise_1-13.c
Exercise_1-14.c
Exercise_1-15.c
Exercise_1-16.c
Exercise_1-17.c
Exercise_1-18.c
Exercise_1-19.c
Exercise_1-20.c
Exercise_1-21.c
Exercise_1-22.c
Exercise_1-23.c
Exercise_1-24.c

-> Notes from Page-17

#include <stdio.h>

/* copy input to output. */

int main(){
    int c;

    while( ( c = getchar() ) != EOF ){
        putchar(c);
    }
}

The precedence of != is higher than that of =, which means that in the absence of parenthesis the relational test != would be done before the assignment =. So the statement :

c = getchar() != EOF

is equivalent to :

C = ( getchar() != EOF )

• This has the undesired effect of setting c to 0 or 1, depending on whether or not the call of getchar encountered end of file.

The above Example is for the file 06.c.

-> The value of EOF is -1 C code file to check it is here.

-> The grammatical rules of C require that a for statement have a body. The isolated semi-colon, called a null statement, can be used for this purpose.

#include <stdio.h>

int main(){
    int a;
    for ( a = 0; a < 10; a++ )
        ;                           /* isolated semi-colon */
    printf("%d", a);
}