空间管理您的位置: 51Testing软件测试网 » testingzhang » 日志

C Primer Plus 全书源代码（三）

上一篇 / 下一篇 2012-03-19 09:28:09 / 个人分类：学习日志

// scores_in.c -- uses loops for array processing
/*
#include <stdio.h>
#define SIZE 10
#define PAR 72
int main(void)
{
    int index, score[SIZE];
    int sum = 0;
    float average;

    printf("Enter %d golf scores:\n", SIZE);
    for (index = 0; index < SIZE; index++)
        scanf("%d", &score[index]); // read in the ten scores
    printf("The scores read in are as follows:\n");
    for (index = 0; index < SIZE; index++)
        printf("%5d", score[index]); // verify input
    printf("\n");
    for (index = 0; index < SIZE; index++)
        sum += score[index];         // add them up
    average = (float) sum / SIZE;    // time-honored method
    printf("Sum of scores = %d, average = %.2f\n", sum, average);
    printf("That's a handicap of %.0f.\n", average - PAR);

return 0;
}
*/
///////////////////////////////////////////////
// an answer to the question 16 at page 151
/*
#include<stdio.h>

void main()
{
       int year=0;
       double f;
       for(f=100;f>0;f=f-10)
       {
       printf("at the year %d , the money you have is %g \n",year,f);
              f=f+f*0.08;
              year++;

       }

printf("at the year %d\n",year);
printf("you have no money now!\n");

}

*/
///////////////////////////////////////////////
///////////////////////////////////////////////
//chapter 07 C控制语句：分支与跳转
// colddays.c -- finds percentage of days below freezing
/*
#include <stdio.h>
int main(void)
{
    const int FREEZING = 0;
    float temperature;
    int cold_days = 0;
    int all_days = 0;

    printf("Enter the list of daily low temperatures.\n");
    printf("Use Celsius, and enter q to quit.\n");
    while (scanf("%f", &temperature) == 1)
    {
        all_days++;
        if (temperature < FREEZING)
            cold_days++;
    }
    if (all_days != 0)
        printf("%d days total: %.1f%% were below freezing.\n",
               all_days, 100.0 * (float) cold_days / all_days);
    if (all_days == 0)
        printf("No data entered!\n");

    return 0;
}
*/
///////////////////////////////////////////////
/* cypher1.c -- alters input, preserving spaces */
/*
#include <stdio.h>
#define SPACE ' '             // that's quote-space-quote
int main(void)
{
    char ch;

    ch = getchar();
    while (ch != '\n')        //* while not end of line
    {
        if (ch == SPACE)      //* leave the space
            putchar(ch);      //* character unchanged
        else
            putchar(ch + 1); //* change other characters
        ch = getchar();
    }
    putchar(ch);
    return 0;
}
*/
///////////////////////////////////////////////

// cypher2.c -- alters input, preserving non-letters
/*
#include <stdio.h>
#include <ctype.h>            // for isalpha()
int main(void)
{
    char ch;

    while ((ch = getchar()) != '\n')
    {
        if (isalpha(ch))      // if a letter,
            putchar(ch + 1); // change it
        else                  // otherwise,
            putchar(ch);      // print as is
    }
    putchar(ch);              // print the newline

    return 0;
}
*/
///////////////////////////////////////////////
// chcount.c -- use the logical AND operator
/*
#include <stdio.h>
#define PERIOD '.'
int main(void)
{
    int ch;
    int charcount = 0;

    while ((ch = getchar()) != PERIOD)
    {
        if (ch != '"' && ch != '\'')
            charcount++;
    }
    printf("There are %d non-quote characters.\n", charcount);

    return 0;
}
*/
//////////////////////////////////////////////
// wordcnt.c -- counts characters, words, lines
/*
#include <stdio.h>
#include <ctype.h>         // for isspace()
#define STOP '|'
#define false 0
#define true 1
int main(void)
{
    char c;                 // read in character
    char prev;              // previous character read
    long n_chars = 0L;      // number of characters
    int n_lines = 0;        // number of lines
    int n_words = 0;        // number of words
    int p_lines = 0;        // number of partial lines
    int inword = false;    // == true if c is in a word

    printf("Enter text to be analyzed (| to terminate):\n");
    prev = '\n';            // used to identify complete lines
    while ((c = getchar()) != STOP)
    {
        n_chars++;          // count characters
        if (c == '\n')
            n_lines++;      // count lines
        if (!isspace(c) && !inword)
        {
            inword = true; // starting a new word
            n_words++;      // count word
        }
        if (isspace(c) && inword)
            inword = false; // reached end of word
        prev = c;           // save character value
    }

    if (prev != '\n')
        p_lines = 1;
    printf("characters = %ld, words = %d, lines = %d, ",
          n_chars, n_words, n_lines);
    printf("partial lines = %d\n", p_lines);

    return 0;
}
*/
/////////////////////////////////////////////////////
/* paint.c -- uses conditional operator */
/*
#include <stdio.h>
#define COVERAGE 200       // square feet per paint can
int main(void)
{
    int sq_feet;
    int cans;

    printf("Enter number of square feet to be painted:\n");
    while (scanf("%d", &sq_feet) == 1)
    {
        cans = sq_feet / COVERAGE;
        cans += (sq_feet % COVERAGE == 0) ? 0 : 1;
        printf("You need %d %s of paint.\n", cans,
                cans == 1 ? "can" : "cans");
        printf("Enter next value (q to quit):\n");
    }

return 0;
}
*/
//////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////
//chapter 08 字符输入/输出和输入确认

/* echo.c -- repeats input */
/*
#include <stdio.h>
int main(void)
{
    char ch;

    while ((ch = getchar()) != '#')
                  putchar(ch);

    printf("\n");
    return 0;
}
*/
//////////////////////////////////////////////////////
/* echo_eof.c -- repeats input to end of file */
/*
#include <stdio.h>
int main(void)
{
    int ch;

    while ((ch = getchar()) != EOF) //now you know how to end the program
        putchar(ch);

    return 0;
}
*/
//////////////////////////////////////////////////////
// file_eof.c --open a file and