[C + +] reread the C programming Language

The first time I read this book was a junior year, and now I'm going to reread it again!

Introduction to Chapter I.

1. The only way to learn a new programming language is to use it to write programs.

2. Each program is executed from the beginning of the main function.

3. In the C language, all variables must be declared before they are used.

4. The size of the basic data type in the C language depends on the specific machine.

5. A more complex expression of that type can be used in any situation where the value of a type variable is allowed.

6. The input/output model of the standard library is processed in a character stream, with 0 or more characters in each line, and a newline character at the end.

7. Functions provide an easy way to calculate the encapsulation of a function, which is called by value.

#include <stdio.h>//file copy int main () {int C;while ((c = GetChar ()) = EOF) {Putchar (c);} return 0;}

/* * Write a program that copies the input to the output, and replaces multiple spaces in it with a single space. */#include <    Stdio.h>int Main () {int C;   int flag = 0; Whether the current character is a space while ((c = GetChar ())! = EOF) {if ((c = = ' && flag = = 0) | | (c! = "))            {Putchar (c);        flag =!flag; }} return 0;} 

 #include <stdio.h> #define IN 1//Word # define out 0///outside Word//    Counts the number of rows, the number of words, and the number of characters int main () {int C;       int numlines = 0;       Number of rows int numwords = 0;  Number of words int numcharacters = 0;    Number of characters int state = out;        while ((c = GetChar ()) = EOF) {++numcharacters;        if (c = = ' \ n ') {++numlines;        } if (c = = ' | | c = = ' \ t ' | | c = = ' \ n ') {state = out;            } else if (state = = out) {state = in;        ++numwords;    }} printf ("%d\t%d\t%d\n", Numlines, Numwords, numcharacters); return 0;} 

#include <stdio.h> #define MAXLINE 1000/* * Read into one line of characters */int getline_s (char *s, int lim) {    int c, I;    for (i = 0; i < lim-1 && (c = GetChar ())! = EOF && c! = ' \ n '; ++i) {        s[i] = c;    }       if (c = = ' \ n ') {        s[i] = c;        ++i;    }       S[i] = ' + ';    return i;} /* Copy array */void copy (char *to, char *from) {    int i = 0;    while ((to[i] = From[i])! = ' + ') {        ++i;    }   } int main () {    int len;    int max = 0;    Char Line[maxline];    Char Longest[maxline];    while (len = getline_s (line, MAXLINE)) > 0) {        if (len > Max) {            max = len;            Copy (longest, line);        }       }       if (Max > 0) {        printf ("%s\n", longest);    }       return 0;}

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[C + +] reread the C programming Language