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1、+经典C语言源代码1、(1)某年某月某日是星期几#includeint main()int year, month, day;while (scanf_s(%d%d%d, &year, &month, &day) != EOF)if (month = 1 | month = 2)/判断month是否为1或2year-;month += 12;int c = year / 100;int y = year - c * 100;int week = (c / 4) - 2 * c + (y + y / 4) + (13 * (month + 1) / 5) + day - 1;while (wee
2、k0) week += 7; week %= 7;switch (week)case 1:printf(Mondayn); break;case 2:printf(Tuesdayn); break;case 3:printf(Wednesdayn); break;case 4:printf(Thursdayn); break;case 5:printf(Fridayn); break;case 6:printf(Saturdayn); break;case 0:printf(Sundayn); break;return 0;1、(2)某年某月某日是第几天（一维数组）#include stdio
3、.hvoid main() int i, flag, year, month, day, dayth;int month_day = 0,31,28,31,30,31,30,31,31,30,31,30,31 ;printf(请输入年/月/日：n);scanf_s(%d/%d/%d, &year, &month, &day);dayth = day;flag = (year % 400 = 0) | (year % 4 = 0 & year % 100 != 0);if (flag)month_day2 = 29;for (i = 1; i month; i+)dayth = dayth +
4、month_dayi;printf(%d/%d/%d是第%d天n, year, month, day, dayth);2、30个数中找最小的数及其位置#include stdio.h# define SIZE 30void main() int i;float dataSIZE;int min;printf(请输入%d个浮点数：n,SIZE);for (i = 0; i SIZE; i+) /scanf_s(%f, &datai);datai = rand() % 30 + 1;printf(%f、, datai);min = 0;for (i = 1; i SIZE; i+) if (dat
5、ai datamin)min = i;printf(最小值是%5.2f,位置是%5dn, datamin, min);3、30个数从小到大排序（1）#include stdio.h# define SIZE 30void main() int i,j;float dataSIZE,temp;int min;printf(请输入%d个整型数：n,SIZE);for (i = 0; i SIZE; i+) scanf_s(%f, &datai);for (i = 0; i SIZE; i+) min = i;for (j = i + 1; j SIZE; j+)if (dataj datamin)
6、min = j;temp = datamin;datamin = datai;datai = temp;printf(n排序后的结果是：n);for (i = 0; i SIZE; i+)printf(%5.2f, datai);（2）模块化程序（数组名作为函数参数）#include stdio.h# define SIZE 5void accept_array(float a, int size);void sort(float a, int size);void show_array(float a, int size);void main() float scoreSIZE;accept
7、_array(score, SIZE);printf(排序前：);show_array(score, SIZE);sort(score, SIZE);printf(排序后：);show_array(score, SIZE);void accept_array(float a, int size) int i;printf(请输入%d个分数：, size);for (i = 0; i size; i+)scanf_s(%f, &ai);void show_array(float a, int size) int i;for (i = 0; i size; i+)printf( %5.2f, ai
8、);printf(n);void sort(float a,int size) int i, min, j;float temp;for (i = 0; i SIZE; i+) min = i;for (j = i + 1; j SIZE; j+)if (aj amin)min = j;temp = amin;amin = ai;ai = temp;4、（1）指针加减：#include stdio.h#define SIZE 10void main() int aSIZE = 1,2,3,4,5,6,7,8,9,10 ;int *pa, i;pa = &a0; /pa=a;printf(n);
9、for (i = 0; i SIZE; i+) printf( %d, *pa);/printf( %d, *(pa+1);pa+;（2）指针比较：#include stdio.h#define SIZE 10void main() int aSIZE = 1,2,3,4,5,6,7,8,9,10 ;int *pa, i;int *qa;pa = qa = &a0;printf(请输入%d整型数：,SIZE);for (; pa qa + SIZE; pa+)scanf_s(%d, pa);for (pa-; qa = pa; pa-)printf( %d, *pa);5、两字符串相连：#in
10、clude stdio.h#include string.hvoid str_cat(char str1, char str2);void main() int i, j;char str1160;char str280;printf(请输入第一个字符串：);gets(str1);printf(请输入第二个字符串：);gets(str2);str_cat(str1, str2);puts(str1);void str_cat(char str1, char str2) int i, j;i = 0;while (str1i != 0)i+;j = 0;while (str2j != 0) st
11、r1i = str2j;i+; j+;str1i = 0;6、二维数组（a，b转置）#include stdio.hvoid main() int i, j, b23;int a32 = 1,2,3,4,5,6 ;for (i = 0; i 2; i+) for (j = 0; j 3; j+)bij = aji;printf(na:n);for (i = 0; i 3; i+) for (j = 0; j 2; j+)printf(%5d, aij);printf(n);printf(nb:n);for(i = 0; i 2; i+) for (j = 0; j 3; j+)printf(%
12、5d, bij);printf(n);7、输入一个二维数组并输出（指针）#include stdio.hvoid main() int x23;int i, j;for (i = 0; i 2; i+)for (j = 0; j 3; j+)scanf_s(%d, *(x + i) + j);putchar(n);for (i = 0; i 2; i+)for (j = 0; j 3; j+)printf(%d , *(*(x + i) + j);putchar(n);8、冒泡法排序一个数组#include stdio.h#define size 10void maopao(int a);void main() int a10;int i;printf(请输入10个整数：n);for (i = 0; i 10; i+)scanf_s(%d, &ai);maopao(a);void maopao(int a) int i, j, temp;for (i = 0; i
