C语言第一章基本概念练习。

教材《C程序设计语言》

练习1-3,4　　编写一个用于打印摄氏与化石温度对照表的程序。（带标题）

#include <stdio.h>
#include <math.h>

#define P printf
#define PIN P("input:"L);
#define D "%d"
#define F "%f"
#define C "%c"
#define L "\n"
#define B " "
#define T "    "
#define S scanf

int main()
{
    int fahr, celsius;
    int lower, upper, step;

    lower = 0;
    upper = 300;
    step = 20;
    fahr = lower;
    P("华氏与摄氏转换表"L);
    P("华氏" B "摄氏" L );
    while(fahr <= upper){
        celsius = 5 * (fahr-32) / 9;
        P(D T D L, fahr, celsius);
        fahr += step;
    }
    return 0;
}

 练习1-5 修改使其逆序（300度到0度）

#include <stdio.h>
#include <math.h>

#define P printf
#define PIN P("input:"L);
#define D "%d"
#define F "%f"
#define C "%c"
#define L "\n"
#define B " "
#define T "    "
#define S scanf

int main()
{
    int fahr, celsius;
    int lower, upper, step;

    lower = 0;
    upper = 300;
    step = 20;

    P("华氏与摄氏转换表"L);
    P("华氏" B "摄氏" L );
   for(fahr = upper; fahr >= lower; fahr -= step){
        celsius = 5 * (fahr-32) / 9;
        P(D T D L, fahr, celsius);
    }
    return 0;
}

练习1-7 编写一个用于打印EOF值的程序

#include <stdio.h>
#include <math.h>

#define P printf
#define PIN P("input:"L);
#define D "%d"
#define F "%f"
#define C "%c"
#define L "\n"
#define B " "
#define T "    "
#define S scanf

int main()
{
    int c;

    P(D L C L F L , EOF, EOF, EOF);
    return 0;
}

看来EOF是int的-1；

练习1-8　　编写一个用于统计空格、制表符、换行符个数的程序。

#include <stdio.h>
#include <math.h>

#define P printf
#define PIN P("input:"L);
#define D "%d"
#define F "%f"
#define C "%c"
#define L "\n"
#define B " "
#define T "    "
#define S scanf

int main()
{
    long c,sl,tl,nl;

    sl = tl = nl = 0;
    while ((c = getchar())!=EOF){
        if (c==' ')
            ++sl;
        else if (c=='\t')
            ++tl;
        else if (c=='\n')
            ++nl;
    }
    P(D L, sl, tl, nl);
    return 0;
}

最后应该看lastchar是不是‘n'，不是得加一个新行数。。。