你们要的C语言实例大全-基础知识篇二
目录
你们要的C语言实例大全-基础知识篇二
实例11 嵌套if语句
实例12 switch语句
实例13 for语句
实例14 while语句
实例15 do-while语句
实例16 break和continue语句
实例17 exit()语句
实例18 综合实例
实例19 一维数组
实例20 二维数组
实例21 字符数组
实例22 数组初始化
实例23 数组应用
下一篇：【C】【吐血整理】你们要的C语言实例大全-基础知识篇三
实例11 嵌套if语句
nesting.c
# include <stdio.h>
void main()
{/* sex代表输血者的性别，weight代表输血者的体重，cubage代表输血量 */int sex, weight, cubage;printf("请给出输血者的性别和体重：");scanf("%d,%d", &sex, &weight);if(sex >= 0) /* 若变量sex的数值为非负数，则表示为男性 */{if(weight >= 120){cubage = 200;printf("此人应该输血：%d毫升\n", cubage);}else{cubage = 180;printf("此人应该输血：%d毫升\n", cubage);}}else /* 否则，表示为女性 */{if(weight >= 100){cubage = 150;printf("此人应该输血：%d毫升\n", cubage);}else{cubage = 120;printf("此人应该输血：%d毫升\n", cubage);}}
}
演示
请给出输血者的性别和体重：1,125
此人应该输血：200毫升
请给出输血者的性别和体重：-1,90
此人应该输血：120毫升
实例12 switch语句
switch.c
#include <stdio.h>void main()
{int num;/* 下面定义的各变量，分别代表个位，十位，百位，千位，万位，十万位以及位数 */int indiv, ten, hundred, thousand; int ten_thousand, hundred_thousand, place;printf("请输入一个整数(0～999999)：");scanf("%d", &num);/* 判断变量num的位数 */if(num > 99999)place = 6;else if(num > 9999)place = 5;else if(num > 999)place = 4;else if(num > 99)place = 3;else if(num > 9)place = 2;elseplace = 1;printf("place = %d\n", place);printf("每位数字为：");/* 求出num在各位上的值 */hundred_thousand = num/100000;ten_thousand = (num - hundred_thousand*100000)/10000;thousand = (num - hundred_thousand*100000 - ten_thousand*10000)/1000;hundred = (num - hundred_thousand*100000 - ten_thousand*10000 - thousand*1000)/100;ten = (num - hundred_thousand*100000 - ten_thousand*10000 - thousand*1000 - hundred*100)/10;indiv = num - hundred_thousand*100000 - ten_thousand*10000 - thousand*1000 - hundred*100 - ten*10;/* 判断变量num的位数，并根据位数做出相应的输出 */switch(place){case 1: printf("%d", indiv);printf("\n反序数字为：");printf("%d\n", indiv);break;case 2: printf("%d, %d", ten, indiv);printf("\n反序数字为：");printf("%d%d\n", indiv, ten);break;case 3: printf("%d, %d, %d", hundred, ten, indiv);printf("\n反序数字为：");printf("%d%d%d\n", indiv, ten, hundred);break;case 4: printf("%d, %d, %d, %d", thousand, hundred, ten, indiv);printf("\n反序数字为：");printf("%d%d%d%d\n", indiv, ten, hundred, thousand);break;case 5: printf("%d, %d, %d, %d, %d", ten_thousand, thousand, hundred, ten, indiv);printf("\n反序数字为：");printf("%d%d%d%d%d\n", indiv, ten, hundred, thousand, ten_thousand);break;case 6: printf("%d, %d, %d, %d, %d, %d", hundred_thousand, ten_thousand, thousand, hundred, ten, indiv);printf("\n反序数字为：");printf("%d%d%d%d%d%d\n", indiv, ten, hundred, thousand,ten_thousand, hundred_thousand);break;default: printf("Not find.\n");break;}
}
演示
guo@ubuntu:~/test/Clanguage/1/Exam012$ ./a.out
请输入一个整数(0～999999)：999
place = 3
每位数字为：9, 9, 9
反序数字为：999
guo@ubuntu:~/test/Clanguage/1/Exam012$ ./a.out
请输入一个整数(0～999999)：520
place = 3
每位数字为：5, 2, 0
反序数字为：025
实例13 for语句
asterisk.c
# include <stdio.h>void main()
{int i, j, k;/* 变量i从0到4，表示所画菱形图的第一至第五行 */for(i = 0; i <= 4; i++){/* 当行数为i时，空格数是i的函数，为4-i个 */for(j = 0; j <= 3-i; j++)printf(" ");/* 星号数也是i的函数，为2i+1个 */for(k = 0; k <= 2*i; k++)printf("*");printf("\n");}/* 变量i从0到3，表示所画菱形图的第六至第九行 */for(i = 0; i <= 3; i++){/* 当行数为i时，空格数是i的函数，此时为i个 */for(j = 0; j <= i; j++)printf(" ");/* 星号数也是i的函数，此时为7-2i个 */for(k = 0; k <= 6-2*i; k++)printf("*");printf("\n");}
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam013# ./a.out ****************
*************************
实例14 while语句
common.c
# include <stdio.h>void main()
{int x, y, num1, num2, temp;printf("请输入两个正整数：\n");scanf("%d %d", &num1, &num2);if(num1 < num2){temp = num1;num1 = num2;num2 = temp;}x = num1;y = num2;while(y != 0){temp = x%y;x = y;y = temp;}printf("它们的最大公约数为：%d\n", x);printf("它们的最小公倍数为：%d\n", num1*num2/x);
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam014# ./a.out
请输入两个正整数：
34
59
它们的最大公约数为：1
它们的最小公倍数为：2006
实例15 do-while语句
count.c
# include <math.h>
# include <stdio.h> /* 数学函数库 */void main()
{/* 用s表示多项式的值，用t表示每一项的值 */double s, t, x;int n;printf("please input x: ");scanf("%lf", &x);/* 符初值 */t = x;n = 1;s = x;/* 进行叠加运算 */do{n = n + 2 ;t = t * (-x*x)/((float)(n)-1)/(float)(n);s = s + t;} while (fabs(t)>=1e-8);printf("sin(%f) = %lf\n", x, s);
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam015# ./a.out
please input x: 43
sin(43.000000) = -24.157247
实例16 break和continue语句
area.c
# include <stdio.h>void main( )
{int radius;double area;for(radius = 1; radius <= 10 ; radius++){area = 3.1416 * radius * radius;/* 若圆面积超过120，则跳出for循环，不予输出 */if(area >= 120.0)break;printf("square = %f\n", area);}printf("now radius=%d\n\n", radius-1);for(radius = 1; radius <= 10 ; radius++){area = 3.1416 * radius * radius;/* 若圆面积没有超过60，则不输出而是从新开始循环 */if(area < 120.0)continue;printf("square = %f\n", area);}printf("now radius=%d\n", radius-1);
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam016# ./a.out
square = 3.141600
square = 12.566400
square = 28.274400
square = 50.265600
square = 78.540000
square = 113.097600
now radius=6square = 153.938400
square = 201.062400
square = 254.469600
square = 314.160000
now radius=10
实例17 exit()语句
exit.c
# include <stdlib.h>
# include <stdio.h>void main()
{int month;int day;printf("please input the month number: ");scanf("%d", &month);switch (month){case 1:case 3:case 5:case 7:case 8:case 10:case 12: day=31;break;case 4:case 6:case 9:case 11: day=30;break;case 2: day=28;break;default: exit(0);}printf("1999.%d has %d days.\n", month, day);
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam017# ./a.out
please input the month number: 11
1999.11 has 30 days.
实例18 综合实例
integration.c
# include <math.h>
# include <stdio.h>void main( )
{int i, j, num;int p, q, flagp, flagq;printf("Please input a plus integer: ");scanf("%d", &num);/* 代码 (num%2)!=0) 表示num不能被2整除 */if(((num%2)!=0) || (num<=4))printf("input data error!\n");else{p = 1;/* do-while循环体 */do {p = p + 1;q = num - p;flagp = 1;flagq = 1;/* for循环体 */for(i=2; i<=(int)(floor(sqrt((double)(p)))); i++){if((p%i) == 0){flagp = 0;break;}}/* while循环体 */j = 2;while(j <= (int)(floor(sqrt((double)(q))))){if ((q%j) == 0){flagq = 0;break;}j++;}} while (flagp*flagq == 0);printf("%d = %d + %d \n", num, p, q);}
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam018# ./a.out
Please input a plus integer: 48
48 = 5 + 43
实例19 一维数组
onedim.c
/* 使用选择法排序 */
# include <stdio.h>void main()
{int i, j, min, temp;/* 定义一个整型得一维数组 */int array[10];/* 输入数据 */printf("Please input ten integer: \n");for(i=0; i<10; i++){printf("array[%d] = ", i);scanf("%d", &array[i]);}printf("The array is: ");for(i=0; i<10; i++)printf("%d ", array[i]);printf("\n");/* 排序 */for(i=0; i<9; i++){min = i;for(j=i; j<10; j++)if(array[min]>array[j]) min = j;temp = array[i];array[i] = array[min];array[min] = temp;}/* 输出 */printf("\nThe result: \n");for(i=0; i<10; i++)printf("%d ", array[i]);printf("\n");
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam019# ./a.out
Please input ten integer:
array[0] = 22
array[1] = 34
array[2] = 56
array[3] = 76
array[4] = 4
array[5] = 31
array[6] = 15
array[7] = 88
array[8] = 999
array[9] = 100
The array is: 22 34 56 76 4 31 15 88 999 100 The result:
4 15 22 31 34 56 76 88 100 999
实例20 二维数组
twodim.c
# include <stdio.h>void main()
{int array[16][16];int i, j, k, m, n;/* 变量初始化 */m = 1;while(m == 1){printf("请输入n(0<n<=15)，n是奇数)\n");scanf("%d", &n);/* 判断n是否是大于0小于等于15的奇数 */if((n!=0) && (n<=15) && (n%2!=0)){printf("矩阵阶数是 %d\n", n);m = 0;}}/* 数组赋初值为0 */for(i=1; i<=n; i++)for(j=1; j<=n; j++)array[i][j] = 0;/* 建立魔方阵 */j = n/2 + 1;array[1][j] = 1;for(k=2; k<=n*n; k++){i = i - 1;j = j + 1;if((i<1) && (j>n)){i = i + 2;j = j - 1;}else{if(i < 1)i = n;if(j > n)j = 1;}if(array[i][j] == 0)array[i][j] = k;else{i = i + 2;j = j - 1;array[i][j] = k;}}/* 输出魔方阵 */for(i=1; i<=n; i++){for(j=1; j<=n; j++)printf("%5d", array[i][j]);printf("\n");}
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam020# ./a.out
请输入n(0<n<=15)，n是奇数)
3
矩阵阶数是 38 1 63 5 74 9 2
实例21 字符数组
chararr.c
# include <stdio.h>
/* 宏定义 */
# define MAX 100
# define LEN 80/* 一个非常简单的文本编辑器 */
void main()
{char text[MAX][LEN];register int t, i, j; /* 定义三个寄存器变量 *//* 逐行输入字符串 */for(t=0; t<MAX; t++) {printf("%d: ", t);gets(text[t]);if(!text[t][0])break; /* 空行退出 */}/* 按行，逐个字符输出字符串 */for(i=0; i<t; i++) {for(j=0; text[i][j]; j++)putchar(text[i][j]);putchar('\n');}
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam021# ./a.out
0: 22
1: ff
2: tt
3: 5t
4: you
5: me
6: for
7: int
8: log
9: float
10: ls
11: ln
12: ll
13: la
14: python
15: java
16: c
17:
18:
22
ff
tt
5t
you
me
for
int
log
float
ls
ln
ll
la
python
java
c
实例22 数组初始化
init.c
# include <stdio.h>void main()
{/* 有尺寸 *//* 一维整形数组初始化 */int array1[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};/* 一维字符型数组初始化 */char array2[13] = "How are you!"; /* 方式一 */char array3[13] = {'H','o','w',' ','a','r','e',' ','y','o','u','!'}; /* 方式二 *//* 二维整形数组初始化 */int array4[4][4] = {12, 18, 6, 25,23, 10, 32, 16,25, 63, 1, 63,0, 0, 27, 98}; /* 矩阵的形式 *//* 无尺寸 *//* 一维字符型数组初始化 */char array5[] = "How are you!";int array6[][2] = {{ 1,50},{45, 2},{ 2, 0},{12,32},{42,33},{15,18}};
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam022# ./a.out
root@ubuntu:/home/guo/test/Clanguage/1/Exam022#
实例23 数组应用
query.c
/* 学生成绩查询系统 */
# include <stdio.h>
# include <stdlib.h>void main( )
{int select;int i, j;int score[5][7];int average = 0;int sum = 0;do{printf("本程序有4项功能：\n");printf(" 1. 根据学号查询学生成绩\n");printf(" 2. 根据考试号统计成绩\n") ;printf(" 3. 根据考试号和学号查询成绩\n");printf(" 4. 成绩录入\n");printf(" 0. 退出\n");printf(" 请输入选择(0 - 4): ");scanf("%d", &select);switch(select){case 0:printf("OK\n");exit(0);break;case 1:printf("输入学号：");scanf("%d\n", &i);for(j=1; j<7; j++){printf("第%d科成绩是%d\n", j, score[i][j]);sum += score[i][j];}average = sum/6;printf("学生的平均成绩是%d\n", average);break;case 2:printf("输入考试号：");scanf("%d\n", &j);for(i=1; i<5; i++){printf("第%d号学生本科成绩是%d\n", i, score[i][j]);sum += score[i][j];}average = sum/4;printf("本科平均成绩是%d\n", average);break;case 3:printf("输入学号和考试号：");scanf("%d %d\n", &i, &j);printf("第%d号学生的第%d科考试成绩是%d\n", i, j, score[i][j]);break;case 4:printf("请输入成绩\n");for(i=1; i<5; i++)for(j=1; j<7; j++)scanf("%d\n", &score[i][j]);break;default:break;}}while(1);
}
演示
root@ubuntu:/home/guo/test/Clanguage/1/Exam023# ./a.out
本程序有4项功能：1. 根据学号查询学生成绩2. 根据考试号统计成绩3. 根据考试号和学号查询成绩4. 成绩录入0. 退出请输入选择(0 - 4): 4
请输入成绩
76
87
89
98
100
99
97
96
95
79
87
86
85
84
83
66
60
59
67
87
91
92
93
94
95
本程序有4项功能：1. 根据学号查询学生成绩2. 根据考试号统计成绩3. 根据考试号和学号查询成绩4. 成绩录入0. 退出请输入选择(0 - 4): 本程序有4项功能：1. 根据学号查询学生成绩2. 根据考试号统计成绩3. 根据考试号和学号查询成绩4. 成绩录入0. 退出请输入选择(0 - 4): 2
输入考试号：2
2
第1号学生本科成绩是87
第2号学生本科成绩是96
第3号学生本科成绩是84
第4号学生本科成绩是87
本科平均成绩是88
本程序有4项功能：1. 根据学号查询学生成绩2. 根据考试号统计成绩3. 根据考试号和学号查询成绩4. 成绩录入0. 退出请输入选择(0 - 4): 输入考试号：