C语言学习代码<一> .

C语言学习代码<一> .
1. /*------------------------------------------------------------------
2. * ------------------------- scanf 练习 ---------------------------
3. *----------------------------------------------------------------- */
4. /*
5. #include<stdio.h>
6. int main()
7. {
8. int a;
9. printf("请输入一个整数");
10. scanf("%d",&a);
11. printf("%d\n",a);
12. return 0;
13. }*/
14. /*&
15. # include<stdio.h>
16. int main()
17. {
18. int a,b;
19. printf("请输入一个加法格式为：1 + 2：");
20. scanf("%d + %d",&a,&b);
21. printf("%d + %d = %d\n",a,b,a+b);
22. }
23. */
24. /*-----------------------------------------------------
25. *------------------ sizeof 练习----------------------
26. *--------------------------------------------------- */
27. /*#include<stdio.h>
28. int main()
29. {
30. char zi_fu = 0;
31. unsigned char u_zi_fu = 0;
32. printf("变量zi_fu占%d个字节\n",sizeof(zi_fu));
33. printf("char类型变量占%d个字节\n",sizeof(char));
35. printf("变量zi_fu占%d个字节\n",sizeof(u_zi_fu));
36. printf("unsigned char类型变量占%d个字节\n",sizeof(unsigned char));
37. zi_fu='a';
38. sizeof(zi_fu='b');
39. printf("%c\n",zifu);
40. return 0;
41. }*/
42. /*=======================================================
43. * 进制练习
44. *======================================================
45. * */
46. /*#include<stdio.h>
47. int main()
48. {
49. printf("%d %d %d\n",12,012,0x12);
50. printf("%d 0%o 0x%x\n",18,18,18);
51. printf("%p\n",18);
53. return 0;
54. }*/
55. /*============================================================
56. * 二进制练习
57. *========================================================= */
58. /*#include<stdio.h>
59. int main()
60. {
61. int shu_zi = 300;
62. unsigned char zi_fr =shu_zi;
64. }
65. */
66. /*=============================================================
67. * 操作符练习
68. *========================================================== */
69. #include<stdio.h>
70. int main()
71. {
72. int shu_zi=0,shu_zi1=0;
73. printf("15/7=%d\n",15/7);//整数类型的运算只保留整数部分。
74. printf("15 %% 7=%d\n",15%7);
75. shu_zi = shu_zi1=7;//取决于运算顺序，如果从左往右则变量值会不同，但实际计算机是以右往左赋值。
76. printf("%d %d\n",shu_zi,shu_zi1);
77. shu_zi +=2;//相当于shu_zi = shu_zi = 2
78. printf("shu_zi是%d\n",shu_zi);
79. shu_zi *= 2+3;//先计算加法在计算自乘，因为乘法和赋值一起使用时，会把优先级降到和赋值一样。
80. printf("shu_zi是%d\n",shu_zi);
81. return 0;
82. }
```
/*------------------------------------------------------------------
 * ------------------------- scanf 练习 ---------------------------
 *----------------------------------------------------------------- */
/*
#include<stdio.h>
 int main()
{   
    int a;
    printf("请输入一个整数");
    scanf("%d",&a);
    printf("%d\n",a);
    return 0;
}*/
/*&
# include<stdio.h>
int main()
{
    int a,b;
    printf("请输入一个加法格式为：1 + 2：");
    scanf("%d + %d",&a,&b);
    printf("%d + %d = %d\n",a,b,a+b);
}
*/
/*-----------------------------------------------------
 *------------------ sizeof 练习----------------------
 *--------------------------------------------------- */
/*#include<stdio.h>
int main()
{
    char zi_fu = 0;
    unsigned char u_zi_fu = 0;
    printf("变量zi_fu占%d个字节\n",sizeof(zi_fu));
    printf("char类型变量占%d个字节\n",sizeof(char));

    printf("变量zi_fu占%d个字节\n",sizeof(u_zi_fu));
    printf("unsigned char类型变量占%d个字节\n",sizeof(unsigned char));
    zi_fu='a';
    sizeof(zi_fu='b');
    printf("%c\n",zifu);
    return 0;
}*/
/*=======================================================
 *             进制练习
 *======================================================
 * */
/*#include<stdio.h>
int main()
{
    printf("%d %d %d\n",12,012,0x12);
    printf("%d 0%o 0x%x\n",18,18,18);
    printf("%p\n",18);
            
    return 0;
}*/
/*============================================================
 *            二进制练习
 *========================================================= */
/*#include<stdio.h>
int main()
{
    int shu_zi = 300;
    unsigned char zi_fr =shu_zi; 

}
*/
/*=============================================================
 *        操作符练习
 *========================================================== */
#include<stdio.h>
int main()
{
    int shu_zi=0,shu_zi1=0;
    printf("15/7=%d\n",15/7);//整数类型的运算只保留整数部分。
    printf("15 %% 7=%d\n",15%7);
    shu_zi = shu_zi1=7;//取决于运算顺序，如果从左往右则变量值会不同，但实际计算机是以右往左赋值。
    printf("%d  %d\n",shu_zi,shu_zi1);
    shu_zi +=2;//相当于shu_zi = shu_zi = 2
    printf("shu_zi是%d\n",shu_zi);
    shu_zi *= 2+3;//先计算加法在计算自乘，因为乘法和赋值一起使用时，会把优先级降到和赋值一样。
    printf("shu_zi是%d\n",shu_zi);
    return 0;
}
```
[cpp] view plain copy print ?
1. /*------------------------------------------------------------------
2. * ------------------------- scanf 练习 ---------------------------
3. *----------------------------------------------------------------- */
4. /*
5. #include<stdio.h>
6. int main()
7. {
8. int a;
9. printf("请输入一个整数");
10. scanf("%d",&a);
11. printf("%d\n",a);
12. return 0;
13. }*/
14. /*&
15. # include<stdio.h>
16. int main()
17. {
18. int a,b;
19. printf("请输入一个加法格式为：1 + 2：");
20. scanf("%d + %d",&a,&b);
21. printf("%d + %d = %d\n",a,b,a+b);
22. }
23. */
24. /*-----------------------------------------------------
25. *------------------ sizeof 练习----------------------
26. *--------------------------------------------------- */
27. /*#include<stdio.h>
28. int main()
29. {
30. char zi_fu = 0;
31. unsigned char u_zi_fu = 0;
32. printf("变量zi_fu占%d个字节\n",sizeof(zi_fu));
33. printf("char类型变量占%d个字节\n",sizeof(char));
35. printf("变量zi_fu占%d个字节\n",sizeof(u_zi_fu));
36. printf("unsigned char类型变量占%d个字节\n",sizeof(unsigned char));
37. zi_fu='a';
38. sizeof(zi_fu='b');
39. printf("%c\n",zifu);
40. return 0;
41. }*/
42. /*=======================================================
43. * 进制练习
44. *======================================================
45. * */
46. /*#include<stdio.h>
47. int main()
48. {
49. printf("%d %d %d\n",12,012,0x12);
50. printf("%d 0%o 0x%x\n",18,18,18);
51. printf("%p\n",18);
53. return 0;
54. }*/
55. /*============================================================
56. * 二进制练习
57. *========================================================= */
58. /*#include<stdio.h>
59. int main()
60. {
61. int shu_zi = 300;
62. unsigned char zi_fr =shu_zi;
64. }
65. */
66. /*=============================================================
67. * 操作符练习
68. *========================================================== */
69. #include<stdio.h>
70. int main()
71. {
72. int shu_zi=0,shu_zi1=0;
73. printf("15/7=%d\n",15/7);//整数类型的运算只保留整数部分。
74. printf("15 %% 7=%d\n",15%7);
75. shu_zi = shu_zi1=7;//取决于运算顺序，如果从左往右则变量值会不同，但实际计算机是以右往左赋值。
76. printf("%d %d\n",shu_zi,shu_zi1);
77. shu_zi +=2;//相当于shu_zi = shu_zi = 2
78. printf("shu_zi是%d\n",shu_zi);
79. shu_zi *= 2+3;//先计算加法在计算自乘，因为乘法和赋值一起使用时，会把优先级降到和赋值一样。
80. printf("shu_zi是%d\n",shu_zi);
81. return 0;
82. }
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原文地址：https://www.cnblogs.com/fanghui/p/3063992.html