6-1
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>int min2(int x, int y){return x < y ? x : y;}int main(){int a = 0, b = 0;puts("请输入两个整数：");scanf("%d %d", &a, &b);printf("%d", min2(a, b));return 0;}
6-2
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>int min3(int x, int y, int z){int min = x;if (y < min)min = y;if (z < min)min = z;return min;}int main(){int a = 0, b = 0,c=0;puts("请输入3个整数：");scanf("%d %d %d", &a, &b,&c);printf("%d", min3(a, b, c));return 0;}
6-3
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>int cube(int x){return x * x * x;}int main(){int a = 0;puts("输入一个整数：");scanf("%d", &a);int b=cube(a);printf("其立方是：%d", b);return 0;}
6-4
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>int sqr(int x){return x * x;}int pow4(int x){return (sqr(x) * sqr(x));}int main(){int a = 0;puts("输入一个整数：");scanf("%d", &a);int b = pow4(a);printf("其四次方是：%d", b);return 0;}
6-5
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>int sumup(int n){int sum =0;do{sum += n;} while (n-- > 0);return sum;}int main(){int n = 0;printf("请输入一个整数n：");scanf("%d", &n);printf("从1到n之间所有的整数和为：%d", sumup(n));return 0;}
6-6
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>void alert(int n){while (n-- > 0){printf("\a");printf("响铃%d次",n);} }int main(){int n = 0;printf("请输入响铃次数：");scanf("%d", &n);alert(n);return 0;}
6-7
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>void hello(void){printf("hello\n");}int main(void){hello();return 0;}
6-8
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>int min_of(const int v[], int n){int i = 0;int min = v[0];for (i = 0; i < n;i++){if (v[i] < min)min = v[i];}return min;}int main(){int ary[] = {9,2,3,1,0};printf("此数组中最小值为：%d", min_of(ary,5));return 0;}
6-9
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>#define NUMBER 6void rev_intary(int v[], int n){int i = 0;for (i = 0; i < (n / 2); i++){int t = v[i];v[i] = v[n -1 - i];v[n -1 - i] = t;}}int main(){int i = 0;int v[NUMBER] = { 0 };for (i = 0; i < NUMBER; i++){printf("v[%d]:", i);scanf("%d", &v[i]);}rev_intary(v, NUMBER);puts("倒序排列了：");for (i = 0; i < NUMBER; i++){printf("v[%d]=%d\n", i,v[i]);}return 0;}
6-10
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>#define number 5void intary_rcpy(int v1[], const int v2[], int n){int i = 0;for (i = 0; i < n; i++){v1[i] = v2[n -1 -i];}}int main(){int i = 0;int v1[number] = { 0 };int v2[number] = { 0 };for (i = 0; i < number; i++){printf("v2[%d]=", i);scanf("%d", &v2[i]);}printf("v2={");for (i = 0; i < number; i++){if (i < number-1){printf("%d,", v2[i]);}else{printf("%d}\n", v2[i]);}}intary_rcpy(v1, v2, number);puts("倒序后放在v1中");printf("v1={");for (i = 0; i < number; i++){if(i<number-1)printf("%d,", v1[i]);elseprintf("%d}\n", v1[i]);}return 0;}
6-11
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>#define number 7void prt(int v[], int n){int i = 0;for (i = 0; i < n; i++){printf("v[%d]=", i);scanf("%d", &v[i]);}printf("v={");for (i = 0; i < n; i++){if (i < n - 1)printf("%d,", v[i]);elseprintf("%d}\n", v[i]);}}int search_idx(const int v[], int idx[], int key, int n){int i = 0, j = 0;for (i = 0; i <n; i++){if (v[i] == key){idx[j] = i;j++;}}printf("{");for (i = 0; i < j; i++){if (i < j-1)printf("%d,",idx[i]);elseprintf("%d}", idx[i]);}return 0;}int main(){int i = 0;int key = 0;int v[number] = { 0 };int idx[number] = { 0 };prt(v, number);printf("请输入要查找的值：");scanf("%d", &key);search_idx(v, idx, key, number);return 0;}
6-12
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>//这个题我不理解，四行三列矩阵乘三行四列矩阵得到的是一个四行四列矩阵，//怎么放在三行三列矩阵里？我认为编写错误，所以改为放在四行四列矩阵中void mat_mul(const int a[4][3], const int b[3][4], int c[4][4]){int i = 0, j = 0, m = 0;for (i = 0; i < 4; i++){while (m < 4){for (j = 0; j < 3; j++){c[i][m] += a[i][j] * b[j][m];}m++;}m = 0;}}int main(){int i = 0, j = 0;int a[4][3] = { 0 };int b[3][4] = { 0 };int c[4][4] = { 0 };for (i = 0; i < 4; i++){for (j = 0; j < 3; j++){scanf("%3d", &a[i][j]);}}puts("矩阵a：");for (i = 0; i < 4; i++){for (j = 0; j < 3; j++){printf("%3d", a[i][j]);}putchar('\n');}for (i = 0; i < 3; i++){for (j = 0; j < 4; j++){scanf("%3d", &b[i][j]);}}puts("矩阵b：");for (i = 0; i < 3; i++){for (j = 0; j < 4; j++){printf("%3d", b[i][j]);}putchar('\n');}mat_mul(a, b, c);puts("矩阵c:");for (i = 0; i < 4; i++){for (j = 0; j < 4; j++){printf("%3d", c[i][j]);}putchar('\n');}return 0;}
6-13
#define _CRT_SECURE_NO_WARNINGS#include <stdio.h>void mat_add(const int a[4][3], const int b[4][3], int c[2][4][3]){int x, y, z;for (x = 0; x < 2; x++)for (y = 0; y < 4; y++)for (z = 0; z < 3; z++) {c[x][y][z] = a[y][z] + b[y][z];}}void mat_print(const int m[4][3]){int i, j;for (i = 0; i < 4; i++) {for (j = 0; j < 3; j++)printf("%4d", m[i][j]);putchar('\n');}}int main(void){int tensu1[4][3] = { {91, 63, 78}, {67, 72, 46}, {89, 34, 53}, {32, 54, 34} };int tensu2[4][3] = { {97, 67, 82}, {73, 43, 46}, {97, 56, 21}, {85, 46, 35} };int sum[2][4][3]; mat_add(tensu1, tensu2, sum);puts("第一次考试的分数"); mat_print(tensu1); puts("第二次考试的分数"); mat_print(tensu2); puts("总分"); mat_print(sum); return 0;}
6-14
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>int main(){int i = 0;static double arr[5];for (i = 0; i < 5; i++){printf("arr[%d]=%f\n", i, arr[i]);}return 0;}
6-15
#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>void put_count(){static int i = 1;printf("put_count:第%d次\n",i);i++;}int main(){put_count();put_count();put_count();return 0;}
