c_primer_plus_CH6

文章目录

• 循环练习🙈
• • ONE🐵
  • TWO🙉
  • THREE🙈
  • FOUR🙊
  • FIVE🙉
  • SIX🐵
  • SEVEN🙉
  • EIGHT🙊

循环练习🙈

ONE🐵

/** * *     OS: linux*   Time: 2020/04/27* Author: OKfine.*/#include 
#define  ROW (5)int main()
{printf("Hello OKfine\n");for (int i = 0; i < ROW; i++){ // 控制行输出for (int j = 0; j <= i; j++){ // 控制列输出printf("$");}printf("\n");}return 0;
}book@-okfine-:~/c_primer_plus/ch6/ex02$ ./test 
Hello OKfine
$
$$
$$$
$$$$
$$$$$

TWO🙉

/***     OS: linux*   Time: 2020/04/27* Author: OKfine.*/
#include int main()
{printf("Hello OKfine\n");for (char ch = 'F'; ch >= 'A'; ch--){for (char c = 'F'; c >= ch; c--){printf("%c", c);}printf("\n");}return 0;
}book@-okfine-:~/c_primer_plus/ch6/ex03$ ./test 
Hello OKfine
F
FE
FED
FEDC
FEDCB
FEDCBA

THREE🙈

/***     OS: linux*   Time: 2020/04/27* Author: OKfine.*/
#include 
#define  ROW (6)int main()
{printf("Hello OKfine\n");for (char ch = 'A', i = 0; i < ROW; i++){for (char j = 0; j <= i; j++, ch++){printf("%c", ch);}printf("\n");}return 0;
}book@-okfine-:~/c_primer_plus/ch6/ex04$ ./test 
Hello OKfine
A
BC
DEF
GHIJ
KLMNO
PQRSTU

FOUR🙊

/***     OS: linux*   Time: 2020/04/27* Author: OKfine.*/
#include int main()
{char ch_row;printf("Hello OKfine\n");printf("Please enter a character in 26 characters(A ~ Z): ");scanf("%c", &ch_row);for (char ch = 'A'; ch <= ch_row; ch++){// 控制空格输出for (char space = 0; space < ch_row - ch; space++){printf(" ");}// 控制升序输出for (char up = 'A'; up <= ch; up++){printf("%c", up);}// 控制降序输出for (char down = ch - 1; down >= 'A'; down--){printf("%c", down);}printf("\n");}return 0;
}book@-okfine-:~/c_primer_plus/ch6/ex05$ ./test z
Hello OKfine
Please enter a character in 26 characters: ZAABAABCBAABCDCBAABCDEDCBAABCDEFEDCBAABCDEFGFEDCBAABCDEFGHGFEDCBAABCDEFGHIHGFEDCBAABCDEFGHIJIHGFEDCBAABCDEFGHIJKJIHGFEDCBAABCDEFGHIJKLKJIHGFEDCBAABCDEFGHIJKLMLKJIHGFEDCBAABCDEFGHIJKLMNMLKJIHGFEDCBAABCDEFGHIJKLMNONMLKJIHGFEDCBAABCDEFGHIJKLMNOPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUVUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUVWVUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUVWXWVUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUVWXYXWVUTSRQPONMLKJIHGFEDCBA
ABCDEFGHIJKLMNOPQRSTUVWXYZYXWVUTSRQPONMLKJIHGFEDCBA
/* ----------------------------------------------------- */
#include int main()
{char ch_row;printf("Hello OKfine\n");printf("Please enter a character in 26 characters(A ~ Z): ");scanf("%c", &ch_row);// 和上面的代码对比，只改变了下面一行代码.//     ch = 'A' ---> ch = ch_row;// ch <= ch_row ---> ch >= 'A';for (char ch = ch_row; ch >= 'A'; ch--){for (char space = 0; space < ch_row - ch; space++){printf(" ");}for (char up = 'A'; up <= ch; up++){printf("%c", up);}for (char down = ch - 1; down >= 'A'; down--){printf("%c", down);}printf("\n");}return 0;
}book@-okfine-:~/c_primer_plus/ch6/ex05$ ./test 
Hello OKfine
Please enter a character in 26 characters: Z
ABCDEFGHIJKLMNOPQRSTUVWXYZYXWVUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUVWXYXWVUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUVWXWVUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUVWVUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUVUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTUTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSTSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRSRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQRQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPQPONMLKJIHGFEDCBAABCDEFGHIJKLMNOPONMLKJIHGFEDCBAABCDEFGHIJKLMNONMLKJIHGFEDCBAABCDEFGHIJKLMNMLKJIHGFEDCBAABCDEFGHIJKLMLKJIHGFEDCBAABCDEFGHIJKLKJIHGFEDCBAABCDEFGHIJKJIHGFEDCBAABCDEFGHIJIHGFEDCBAABCDEFGHIHGFEDCBAABCDEFGHGFEDCBAABCDEFGFEDCBAABCDEFEDCBAABCDEDCBAABCDCBAABCBAABAA

FIVE🙉

/***     OS: linux*   Time: 2020/04/27* Author: OKfine.*/#include #define  SQUARE(n) (n * n)
#define  CUBE(n)   (n * n * n)int main()
{int max_val, min_val;printf("Hello OKfine\n");printf("Please enter the min value: ");scanf("%d", &min_val);printf("Please enter the max vlaue: ");scanf("%d", &max_val);printf("Number\t\tSquare\t\tCube\n");for (int i = 0, j = min_val; i <= max_val - min_val; i++, j++){printf("%6d %15d %13d\n", j, SQUARE(j), CUBE(j));}return 0;
}book@-okfine-:~/c_primer_plus/ch6/ex06$ ./test 
Hello OKfine
Please enter the min value: 1
Please enter the max vlaue: 10
Number			Square			Cube1               1             12               4             83               9            274              16            645              25           1256              36           2167              49           3438              64           5129              81           72910             100          1000

SIX🐵

/***     OS: linux*   Time: 2020/04/27* Author: OKfine.*/
// sum1: 1.0 + 1.0/2.0 + 1.0/3.0 + 1.0/4.0 ...
// sum2: 1.0 - 1.0/2.0 + 1.0/3.0 - 1.0/4.0 ...
#include int main()
{long int     limits;float        sum1 = 0.0;float        sum2 = 0.0;float        sign = 1.0f;printf("Hello OKfine\n");printf("Please enter the number of sum: ");scanf("%ld", &limits);while (limits > 0){for (long int i = 1; i <= limits; i++){sum1 += 1.0f / i;sum2 += (1.0f / i) * sign;sign = -sign;}printf("The %ldth of sum1 is %.8f\n", limits, sum1);printf("The %ldth of sum2 is %.8f\n", limits, sum2);sum1 = sum2 = 0.0;sign = 1.0f;printf("Please enter the number of sum: ");scanf("%ld", &limits);}printf("Done!\nGoodbye!\n");return 0;
}book@-okfine-:~/c_primer_plus/ch6/ex12$ ./test 
Hello OKfine
Please enter the number of sum: 100
The 100th of sum1 is 5.18737793
The 100th of sum2 is 0.68817192
Please enter the number of sum: 1000
The 1000th of sum1 is 7.48547840
The 1000th of sum2 is 0.69264585
Please enter the number of sum: 10000
The 10000th of sum1 is 9.78761292
The 10000th of sum2 is 0.69309169
Please enter the number of sum: 100000
The 100000th of sum1 is 12.09085083
The 100000th of sum2 is 0.69313407
Please enter the number of sum: 1000000
The 1000000th of sum1 is 14.35735798
The 1000000th of sum2 is 0.69313729
Please enter the number of sum: 0
Done!
Goodbye!

SEVEN🙉

/***     OS: linux*   Time: 2020/04/27* Author: OKfine.*/
#include int main()
{char str[255];int  index = 0;printf("Hello world\n");printf("Please enter a string: ");while(scanf("%c", &str[index]), str[index] != '\n'){index++;}index--;for (; index >= 0; index--){printf("%c", str[index]);}printf("\n");return 0;
}book@-okfine-:~/c_primer_plus/ch6/ex15$ ./test 
Hello world
Please enter a string: Hello OKfine.
.enifKO olleH

EIGHT🙊

/***     OS: linux*   Time: 2020/04/27* Author: OKfine.*/
#include 
#define  DUNBAR_NUMBER (150) // 邓巴数int main()
{int begin_num = 5;int change_num = 0;int week = 1;printf("Hello OKfine\n");while (change_num <= 150){change_num = (begin_num - week) * 2;begin_num = change_num;printf("weeks: %d, friends: %d\n", week, change_num);week++;}return 0;
}weeks: 1, friends: 8
weeks: 2, friends: 12
weeks: 3, friends: 18
weeks: 4, friends: 28
weeks: 5, friends: 46
weeks: 6, friends: 80
weeks: 7, friends: 146
weeks: 8, friends: 276

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