C Primer Plus（4.8）編程練習

/*C Primer Plus (4.7) 5*/

 1 include<stdio.h>
 2 #define BOOK "War and Peace"
 3 int main(void)
 4 {
 5     float cost=12.99;
 6     float percent=80.0;
 7
 8     printf("This copy of \"%s\" sells for $%.2f.\n",BOOK,cost);
 9     printf("That is %.0f%% of list.",percent);/*打印%要這樣“%%”*/
10
11     return 0;
12 }
13 /*
14 輸出樣例：
15
16 This copy of "War and Peace" sells for $12.99.
17 That is 80% of list.
18
19 */

/*C Primer Plus (4.8) 1*/

 1 #include<stdio.h>
 2 int main()
 3 {
 4     char firstname[30];
 5     char lastname[30];
 6
 7     printf("Please enter your first name.\n");
 8     printf("First name:");
 9     scanf("%s",firstname);
10     printf("Please enter your last name.\n");
11     printf("Last name:");
12     scanf("%s",lastname);
13     printf("Hello! %s %s Welcome~!",firstname,lastname);
14
15     return 0;
16 }
17 /*
18 輸出樣例
19
20 Please enter your first name.
21 First name:Tomoko
22 Please enter your last name.
23 Last name:Kuroki
24 Hello! Tomoko Kuroki Welcome~!
25
26 */

/*C Primer Plus (4.8) 2*/

 1 #include<stdio.h>
 2 #include<string.h>
 3 int main()
 4 {
 5     char firstname[30];
 6     char lastname[30];
 7     int string1=0,string2=0;
 8
 9     printf("Please enter your first name.\n");
10     printf("First name:");
11     scanf("%s",firstname);
12     printf("Please enter your last name.\n");
13     printf("Last name:");
14     scanf("%s",lastname);
15     string1=strlen(firstname);
16     string2=strlen(lastname);
17     printf("Request 1:/*\"%s %s\"*/\n",firstname,lastname);
18     printf("Request 2:/*\"%20s %20s\"*/\n",firstname,lastname);
19     printf("Request 3:/*\"%-20s %-20s\"*/\n",firstname,lastname);
20     printf("Request 4:/*%*s %*s*/",string1+3,firstname,string2+3,lastname);
21
22     return 0;
23 }
24 /*
25 輸出樣例
26
27 //Please enter your first name.
28 //First name:Tomoko
29 //Please enter your last name.
30 //Last name:Kuroki
31 // Request 1:/*"Tomoko Kuroki"*/
32 // Request 2:/*"              Tomoko               Kuroki"*/
33 // Request 3:/*"Tomoko               Kuroki              "*/
34 // Request 4:/*   Tomoko    Kuroki*/

/*C Primer Plus (4.8) 3*/

 1 #include<stdio.h>
 2 int main()
 3 {
 4     float num=0;
 5
 6     printf("Please enter a floating-point number:");
 7     scanf("%f",&num);
 8     printf("a:The input is %.1f or %.1e.\n",num,num);
 9     printf("b:The input is %+.3f or %.3E.",num,num);
10
11     return 0;
12 }
13 /*
14 輸出樣例
15
16 Please enter a floating-point number:26.87
17 a:The input is 26.9 or 2.7e+001.
18 b:The input is +26.870 or 2.687E+001.
19
20 */

/*C Primer Plus (4.8) 4*/

 1 #include<stdio.h>
 2 #define I_TO_F 0.08333
 3 int main()
 4 {
 5     char name[30];
 6     float height=0,realheight=0;
 7
 8     printf("Please enter your name and your height(inches).\n");
 9     printf("Your name:");
10     scanf("%s",name);
11     printf("Your height:");
12     scanf("%f",&height);
13     realheight=height*I_TO_F;
14     printf("%s, you are %.3f feet tall.",name,realheight);
15
16     return 0;
17 }
18 /*
19 輸出樣例
20
21 Please enter your name and your height(inches).
22 Your name:Dabney
23 Your height:74.496
24 Dabney, you are 6.208 feet tall.
25
26 */

/*C Primer Plus (4.8) 5*/

 1 #include<stdio.h>
 2 #define BIT 8
 3 int main()
 4 {
 5     float file=0,speed=0,time=0;
 6     printf("Please enter the net speed\n");
 7     printf("The net speed:");
 8     scanf("%f",&speed);
 9     printf("Please enter the size of the file:\n");
10     printf("The size of flie:");
11     scanf("%f",&file);
12     time=file*BIT/speed;
13     printf("At %.2f megabits per seconds, a file of %.2f megabytes\n"
14            "downloads in %.2f seconds.",speed,file,time);
15
16     return 0;
17  }
18  /*
19  輸出樣例
20
21 Please enter the net speed
22 The net speed:18.123
23 Please enter the size of the file:
24 The size of flie:2.203
25 At 18.12 megabits per seconds, a file of 2.20 megabytes
26 downloads in 0.97 seconds.
27
28 */

/*C Primer Plus (4.8) 6*/

 1 #include<stdio.h>
 2 #include<string.h>
 3 int main()
 4 {
 5     char firstname[30];
 6     char lastname[30];
 7     int string1=0,string2=0;
 8
 9     printf("Please enter your first name.\n");
10     printf("First name:");
11     scanf("%s",firstname);
12     string1=strlen(firstname);
13     printf("Please enter your last name.\n");
14     printf("Last name:");
15     scanf("%s",lastname);
16     string2=strlen(lastname);
17     printf("%s %s\n",firstname,lastname);
18     printf("%*d %*d\n",string1,string1,string2,string2);
19     printf("%s %s\n",firstname,lastname);
20     printf("%-*d %-*d\n",string1,string1,string2,string2);
21
22     return 0;
23 }
24 /*
25 輸出樣例
26
27 Please enter your first name.
28 First name:Tomoko
29 Please enter your last name.
30 Last name:Kuroki
31 Tomoko Kuroki
32      6      6
33 Tomoko Kuroki
34 6      6
35
36 */

/*C Primer Plus (4.8) 7*/

 1 #include<stdio.h>
 2 #include<float.h>
 3 int main()
 4 {
 5     double double_value=1.0/3.0;
 6     float float_value=1.0/3.0;
 7
 8     printf("Request1:float_value=%8f double_value=%8.6lf\n",float_value,double_value);
 9     printf("\nRequest2:float_value=%8.12f double_value=%8.12lf\n",float_value,double_value);
10     printf("\nRequest3:float_value=%8.16f double_value=%8.16lf\n",float_value,double_value);
11     printf("\nfloat and double maximum significant digits:\n");
12     printf("FLT_DIG = %d, DBL_DIG = %d\n", FLT_DIG, DBL_DIG);
13     //FLT_DIG代表float有效十进制数字位数
14     //DBL_DIG代表double有效十进制数字位数
15
16     return 0;
17 }
18 /*
19 輸出樣例
20
21 Request1:num1=0.333333 num2=0.333333
22
23 Request2:num1=0.333333333333 num2=0.333333343267
24
25 Request3:num1=0.3333333333333333 num2=0.3333333432674408
26
27 float and double maximum significant digits:
28 FLT_DIG = 6, DBL_DIG = 15
29
30 */

/*C Primer Plus (4.8) 8*/

 1 #include<stdio.h>
 2 #define G_TO_L 3.785f
 3 #define M_TO_KM 1.609f
 4 int main()
 5 {
 6     float miles=0,gallons=0;
 7     float KM=0,L=0;
 8     float Europe=0,USA=0;
 9
10     printf("Please enter the travel journey(miles) and gas consumption(gallons).\n");
11     printf("Travel journey(in miles):");
12     scanf("%f",&miles);
13     printf("Gas consumption(in gallons):");
14     scanf("%f",&gallons);
15     KM=miles*M_TO_KM;
16     L=gallons*G_TO_L;
17     Europe=L/KM;
18     USA=miles/gallons;
19     printf("The USA program measures travel per unit of fuel consumed (higher values, better):"
20            "%.1f Miles/Gallons\n",USA);
21     printf("The European scheme measures the stroke per unit of fuel consumed (the smaller the value, the better):"
22            "%.1f L/KM",Europe);
23
24     return 0;
25 }
26 /*
27 輸出樣例
28
29 Please enter the travel journey(miles) and gas consumption(gallons).
30 Travel journey(in miles):62.137
31 Gas consumption(in gallons):2.1134
32 The USA program measures travel per unit of fuel consumed (higher values, better):29.4 Miles/Gallons
33 The European scheme measures the stroke per unit of fuel consumed (the smaller the value, the better):0.1 L/KM
34
35 */