C primer plus第4章（字符串和格式化输入/输出）习题

a: printf("%2.2f",2.345e2);打印结果234.50

b: printf("%c,%c,%c");打印结果H,i,!

c. #define Q "His Hamlet was funny without being vulgar."

printf("%s,%d");打印结果His Hamlet was funny without being vulgar. , 42

d. printf("%2.2e,%2.2f",1201.0,1201.0)打印结果 1.201e+003, 1201.00

#include <stdio.h>
#define B "booboo"
#define X 10
int main(void)
{
    int age,xp;
    char name[50];
    printf("Please enter your first name.\n");
    scanf("%s",name);
    printf("All right,%s.what`s your age?\n",name);
    scanf("%d",&age);
    xp = age + X;
    printf("That`s a %s! You must be at least %d.\n",B,xp);
    return 0;
}

#include <stdio.h>
#define BOOK "War and Peace"
int main (void)
{
    float cost = 12.99;
    float percent = 80.0;
    printf("This copy of \"%s\" sells for $%.2f.\n",BOOK,cost);
    printf("That is %.0f%% of list.",percent);
    return 0;
}

a.字段宽度等于数字位数的十进制整数 %d

b.形如8A、字段宽度为4的十六进制整数 %4x

c.形如232.346、字段宽度为10的浮点数 %10.3f

d.一个形如2.33e+002、字段宽度为12的浮点数 %12.2e

e.一个字段宽度为30、左对齐的字符串 %-30s

a.一个字段宽度为15的unsigned long 整数 %15lu

b.一个形如0x8a/阻断宽度为4的十六进制整数 %#4x

c.一个形如2.33E+02、字段宽度为12、左对齐的浮点数 %-12.2e

d.一个形如+232.346、字段宽度为10的浮点数 %+10.3f

e.一个字符串的前8个字符，字段宽度为8字符 %8.8s

a.一个字段宽度为6、最少有4位数字的十进制整数 %6.4d

b.一个字段宽度在参数列表中给定的八进制整数 %*o

c.一个字段宽度为2的字符 %2c

d.一个形如+3.13、字段宽度等于数字中字符个数的浮点数 %+0.2f

e.一个字符串的前5个字符，字段宽度为7、左对齐 %-7.5s

9.为下列每个输入行提供一个对其进行读取的scanf语句

a.101 scanf("%d",&num)

b.22.32 8.34e-09scanf("%f%f",&a,&b)

c.linguini scanf("%s",s)

d.catch 22 char a int bscanf("%s %d",a,&b)

e.catch 22（跳过catch） char ascanf("%s %d",a,&b)

#include <stdio.h>
int main (void)
{
    char firstName[20],lastName[20];
    printf("请输入名字:\n");
    scanf("%s",lastName);
    printf("请输入姓氏:\n");
    scanf("%s",firstName);
    printf("%s,%s",lastName,firstName);
}

#include <stdio.h>
#include <string.h>
int main (void)
{
    char name[20];
    printf("请输入名字:\n");
    scanf("%s",name);
    printf("\"%s\"\n",name);
    printf("\"%20s\"\n",name);
    printf("\"%-20s\"\n",name);
    printf("\"%*s\"",strlen(name)+3,name);
}

#include <stdio.h>
int main (void)
{
    float num;
    scanf("%f",&num);
    printf("The input is %.1f or %.1e\n",num,num);
    printf("The input is %+6.3f or %.3e",num,num);
}

#include <stdio.h>
int main (void)
{
    float num;
    printf("请输入你的身高：\n");
    scanf("%f",&num);
    printf("Dabney, you are %.3f feet tall",num);
}

#include <stdio.h>
#include <string.h>
int main (void)
{
    char firstName[20],lastName[20];
    int  fl,ll;
    printf("请输入名字:\n");
    scanf("%s",lastName);
    printf("请输入姓氏:\n");
    scanf("%s",firstName);
    ll = strlen(lastName);
    fl = strlen(firstName);
    printf("%s %s\n",lastName,firstName);
    printf("%*d %*d\n",ll,ll,fl,fl);
    printf("%s %s\n",lastName,firstName);
    printf("%-*d %-*d",ll,ll,fl,fl);
}

#include <stdio.h>
#include <float.h>
int main (void)
{
    double d = 1.0/3.0;
    float f = 1.0/3.0;
    printf("%.4f,%.4f\n",d,f);
    printf("%.12f,%.12f\n",d,f);
    printf("%.16f.%.16f\n",d,f);
    printf("%f,%f",FLT_DIG,DBL_DIG);
}

#include <stdio.h>
#include <float.h>
#define ITK 1.609
int main (void)
{
    const GTS = 3.785;
    double i;
    double g;
    printf("请输入行驶英里数\n");
    scanf("%f",&i);
    printf("请输入消耗汽油加仑数\n");
    scanf("%f",&g);
    printf("%f",(i*ITK)/(g*GTS)*100);
}

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C primer plus第4章（字符串和格式化输入/输出）习题

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