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== 任务7 == 输入5个正方形的边长,输出它们的面积。 {{{#!cplusplus #include <stdio.h> int main() { int length; int square_area; printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); return 0; } }}} {{{#!cplusplus #include <stdio.h> void input_calculate_output() { printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); } int main() { input_calculate_output(); input_calculate_output(); input_calculate_output(); input_calculate_output(); input_calculate_output(); return 0; } }}} 目标:掌握函数的概念(无参数、无返回值) == 任务8 == 输入5个正方形的边长,输出它们的面积总和。 {{{#!cplusplus #include <stdio.h> int input_calculate() { printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; return square_area; } int main() { int total_area = 0; total_area = total_area + input_calculate_output(); total_area = total_area + input_calculate_output(); total_area = total_area + input_calculate_output(); total_area = total_area + input_calculate_output(); total_area = total_area + input_calculate_output(); printf("The total area of the squares is %d.", total_area); return 0; } }}} 目标:了解有返回值的函数的概念 == 任务9 == 设计一个程序,已知圆的圆心在(3.0, 4.5),圆周上有一点(7.0, 7.5),计算并输出圆的面积。 {{{#!cplusplus #include <stdio.h> #include <math.h> int main() { float radius; radius = sqrt( (7.0-3.0)*(7.0-3.0) + (7.5 - 4.5)*(7.5 - 4.5) ); printf("The area of the circle is %f", 3.14159 * radius * radius); } }}} {{{#!cplusplus #include <stdio.h> #include <math.h> float square(float x) { return x*x; } int main() { float radius; radius = sqrt( square(7.0-3.0) + square(7.5 - 4.5) ); printf("The area of the circle is %f", 3.14159 * square(radius)); } }}} 目标:了解有参数的函数的概念 == 任务10 == 写一个程序,输出边长是1,2,3,4,5的正方形的面积。 {{{#!cplusplus #include <stdio.h> int main() { int length; int square_area; length = 1; square_area = length * length; printf("The area of the square is %d.", square_area); length = 2; square_area = length * length; printf("The area of the square is %d.", square_area); length = 3; square_area = length * length; printf("The area of the square is %d.", square_area); length = 4; square_area = length * length; printf("The area of the square is %d.", square_area); length = 5; square_area = length * length; printf("The area of the square is %d.", square_area); return 0; } }}} {{{#!cplusplus #include <stdio.h> int main() { int length; int square_area; length = 1; while(length <= 5) { square_area = length * length; printf("The area of the square is %d.", square_area); length = length + 1; } } }}} {{{#!cplusplus #include <stdio.h> int main() { int length; int square_area; for(length = 1; length <= 5; length = length + 1) { square_area = length * length; printf("The area of the square is %d.", square_area); } } }}} 目标:掌握循环的概念 |
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== 任务7 == 输入5个正方形的边长,输出它们的面积。 {{{#!cplusplus #include <stdio.h> int main() { int length; int square_area; printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); return 0; } }}} {{{#!cplusplus #include <stdio.h> void input_calculate_output() { printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; printf("The area of the square is %d.", square_area); } int main() { input_calculate_output(); input_calculate_output(); input_calculate_output(); input_calculate_output(); input_calculate_output(); return 0; } }}} 目标:掌握函数的概念(无参数、无返回值) == 任务8 == 输入5个正方形的边长,输出它们的面积总和。 {{{#!cplusplus #include <stdio.h> int input_calculate() { printf("Please enter the length of square:"); scanf("%d", &length); sqaure_area = length * length; return square_area; } int main() { int total_area = 0; total_area = total_area + input_calculate_output(); total_area = total_area + input_calculate_output(); total_area = total_area + input_calculate_output(); total_area = total_area + input_calculate_output(); total_area = total_area + input_calculate_output(); printf("The total area of the squares is %d.", total_area); return 0; } }}} 目标:了解有返回值的函数的概念 == 任务8 == 设计一个程序,已知圆的圆心在(3.0, 4.5),圆周上有一点(7.0, 7.5),计算并输出圆的面积。 {{{#!cplusplus #include <stdio.h> #include <math.h> int main() { float radius; radius = sqrt( (7.0-3.0)*(7.0-3.0) + (7.5 - 4.5)*(7.5 - 4.5) ); printf("The area of the circle is %f", 3.14159 * radius * radius); } }}} {{{#!cplusplus #include <stdio.h> #include <math.h> float square(float x) { return x*x; } int main() { float radius; radius = sqrt( square(7.0-3.0) + square(7.5 - 4.5) ); printf("The area of the circle is %f", 3.14159 * square(radius)); } }}} 目标:了解有参数的函数的概念 == 任务9 == 写一个程序,输出边长是1,2,3,4,5的正方形的面积。 |
== 任务11 == 输入5个正方形,输出面积最大的正方形的面积。 |
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length = 1; square_area = length * length; printf("The area of the square is %d.", square_area); length = 2; square_area = length * length; printf("The area of the square is %d.", square_area); length = 3; square_area = length * length; printf("The area of the square is %d.", square_area); length = 4; square_area = length * length; printf("The area of the square is %d.", square_area); length = 5; square_area = length * length; printf("The area of the square is %d.", square_area); return 0; } }}} {{{#!cplusplus #include <stdio.h> int main() { int length; int square_area; length = 1; while(length <= 5) { square_area = length * length; printf("The area of the square is %d.", square_area); length = length + 1; } } }}} {{{#!cplusplus #include <stdio.h> int main() { int length; int square_area; |
int max_square_area; max_square_area = 0; |
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printf("The area of the square is %d.", square_area); | if(square_area > max_square_area) { max_square_area = square_area; } |
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} }}} 目标:掌握循环的概念 == 任务9 == 目标:掌握数组的概念 |
printf("The max area of the squares is %d.", max_square_area); } }}} 目标:进一步掌握循环和分支语句配合。 |
C语言实例教程 Illustrated C
本教程主要为程序设计的初学者设计,通过C语言了解程序设计的基本概念。同时,也供学习过C语言,但是也针对程序设计的一些基本概念不甚了解的读者设计,可以用来加深对基本概念的理解。
本教程以任务驱动的方式设计,读者跟随教程完成一个一个的小的程序设计任务,从而掌握C语言的基本语法和程序设计的方法。本教程不就语法细节进行详述,有关语法细节可以参看相关链接。
1. 任务1
设计一个C语言程序,在屏幕上输出Hello world。编译并且运行它。
目标:了解C语言程序的基本结构,掌握C语言程序编译运行的方法。
2. 任务2
设计一个C语言程序,计算并输出边长是5的正方形的面积。
目标:了解字面常量、表达式的基本概念
3. 任务3
设计一个程序,计算并输出半径是5的圆形的面积。
目标:了解类型的概念
4. 任务4
设计一个程序,计算并输出一个半径是5的圆形和一个边长是5的正方形的面积总和。
1 #include <stdio.h>
2 int main() {
3 int length;
4 int square_area;
5 float radius;
6 float circle_area;
7 float total_area;
8
9 length = 5;
10 square_area = length * length;
11 radius = 5;
12 circle_area = 3.14159 * radius * radius;
13 total_area = square_area + circle_area;
14 printf("The total area of the square and circle is %f", total_area);
15 return 0;
16 }
目标:掌握变量的基本概念
5. 任务5
设计一个程序,输入正方形的边长,输出正方形的面积
目标:掌握简单的输入输出,进一步理解变量的概念
6. 任务7
输入5个正方形的边长,输出它们的面积。
1 #include <stdio.h>
2 int main() {
3 int length;
4 int square_area;
5
6 printf("Please enter the length of square:");
7 scanf("%d", &length);
8 sqaure_area = length * length;
9 printf("The area of the square is %d.", square_area);
10
11 printf("Please enter the length of square:");
12 scanf("%d", &length);
13 sqaure_area = length * length;
14 printf("The area of the square is %d.", square_area);
15
16 printf("Please enter the length of square:");
17 scanf("%d", &length);
18 sqaure_area = length * length;
19 printf("The area of the square is %d.", square_area);
20
21 printf("Please enter the length of square:");
22 scanf("%d", &length);
23 sqaure_area = length * length;
24 printf("The area of the square is %d.", square_area);
25
26 printf("Please enter the length of square:");
27 scanf("%d", &length);
28 sqaure_area = length * length;
29 printf("The area of the square is %d.", square_area);
30 return 0;
31 }
1 #include <stdio.h>
2
3 void input_calculate_output() {
4 printf("Please enter the length of square:");
5 scanf("%d", &length);
6 sqaure_area = length * length;
7 printf("The area of the square is %d.", square_area);
8 }
9 int main() {
10 input_calculate_output();
11 input_calculate_output();
12 input_calculate_output();
13 input_calculate_output();
14 input_calculate_output();
15 return 0;
16 }
目标:掌握函数的概念(无参数、无返回值)
7. 任务8
输入5个正方形的边长,输出它们的面积总和。
1 #include <stdio.h>
2
3 int input_calculate() {
4 printf("Please enter the length of square:");
5 scanf("%d", &length);
6 sqaure_area = length * length;
7 return square_area;
8 }
9 int main() {
10 int total_area = 0;
11 total_area = total_area + input_calculate_output();
12 total_area = total_area + input_calculate_output();
13 total_area = total_area + input_calculate_output();
14 total_area = total_area + input_calculate_output();
15 total_area = total_area + input_calculate_output();
16 printf("The total area of the squares is %d.", total_area);
17 return 0;
18 }
目标:了解有返回值的函数的概念
8. 任务9
设计一个程序,已知圆的圆心在(3.0, 4.5),圆周上有一点(7.0, 7.5),计算并输出圆的面积。
目标:了解有参数的函数的概念
9. 任务10
写一个程序,输出边长是1,2,3,4,5的正方形的面积。
1 #include <stdio.h>
2 int main() {
3 int length;
4 int square_area;
5 length = 1;
6 square_area = length * length;
7 printf("The area of the square is %d.", square_area);
8 length = 2;
9 square_area = length * length;
10 printf("The area of the square is %d.", square_area);
11 length = 3;
12 square_area = length * length;
13 printf("The area of the square is %d.", square_area);
14 length = 4;
15 square_area = length * length;
16 printf("The area of the square is %d.", square_area);
17 length = 5;
18 square_area = length * length;
19 printf("The area of the square is %d.", square_area);
20 return 0;
21 }
目标:掌握循环的概念
10. 任务6
设计一个程序,输入正方形的边长,输出正方形的面积。如果输入的是一个负数,给出错误提示。
目标:掌握分支的概念,缩进的编程风格
11. 任务11
输入5个正方形,输出面积最大的正方形的面积。
1 #include <stdio.h>
2 int main() {
3 int length;
4 int square_area;
5 int max_square_area;
6
7 max_square_area = 0;
8 for(length = 1; length <= 5; length = length + 1) {
9 square_area = length * length;
10 if(square_area > max_square_area) {
11 max_square_area = square_area;
12 }
13 }
14 printf("The max area of the squares is %d.", max_square_area);
15 }
目标:进一步掌握循环和分支语句配合。