186 lines
3.3 KiB
Markdown
186 lines
3.3 KiB
Markdown
---
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title: 第八次作业（答案）
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date: 2020-12-08 16:29:01
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tags:
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---
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# P292-10
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```C
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#include <stdio.h>
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void swap(int array[], int i, int j)
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{
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int tmp = array[i];
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array[i] = array[j];
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array[j] = tmp;
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}
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int main(void)
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{
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int mat[5][5];
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printf("请输入5x5矩阵的25个元素：\n");
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for (int i = 0; i < 5; ++i) {
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for (int j = 0; j < 5; ++j) {
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scanf("%d", &mat[i][j]);
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}
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}
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int* array = *mat;
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for (int i = 0; i < 4; ++i) {
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int min = array[0];
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for (int j = i + 1; j < 25; ++j) {
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if (array[j] < array[i]) {
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swap(array, i, j);
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}
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}
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}
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int max = array[5];
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for (int i = 4; i < 25; ++i) {
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if (array[i] > max) {
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max = array[i];
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}
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}
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printf("%5d %5d\n %5d \n%5d %5d\n", array[0], array[1], max, array[2], array[3]);
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return 0;
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}
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```
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# P292-12
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```C
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#include <stdio.h>
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#include <string.h>
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void sort_str(char* str[], int n)
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{
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for (int i = 0; i < n - 1; ++i) {
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int done = 1;
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for (int j = 0; j < n - i - 1; ++j) {
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if (strcmp(str[j], str[j + 1]) > 0) {
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char* tmp = str[j + 1];
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str[j + 1] = str[j];
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str[j] = tmp;
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done = 0;
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}
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}
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if (done) {
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break;
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}
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}
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}
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int main(void)
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{
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char inputs[5][100];
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for (int i = 0; i < 5; ++i) {
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fgets(inputs[i], 100, stdin);
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}
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char* str[5];
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for (int i = 0; i < 5; ++i) {
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str[i] = inputs[i];
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}
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sort_str(str, 5);
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for (int i = 0; i < 5; ++i) {
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printf("%s", str[i]);
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}
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return 0;
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}
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```
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# P292-14
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```C
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#include <stdio.h>
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void reverse(int n)
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{
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int m;
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scanf("%d", &m);
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if (n > 1) {
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reverse(n - 1);
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}
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printf("%d ", m);
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}
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int main(void)
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{
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printf("请问几个数？\nn = ");
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int n;
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scanf("%d", &n);
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printf("请依次输入这些数：\n");
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reverse(n);
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printf("\n");
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return 0;
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}
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```
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# P292-17
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```C
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#include <stdio.h>
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int strcmp(char* p1, char* p2)
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{
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for (int i = 0;; ++i) {
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if (p1[i] == '\0') {
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if (p2[i] == '\0') {
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return 0;
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}
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return -1;
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}
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if (p2[i] == '\0') {
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return 1;
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}
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if (p1[i] > p2[i]) {
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return 1;
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}
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if (p1[i] < p2[i]) {
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return -1;
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}
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}
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}
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int main(void)
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{
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char a[100], b[100];
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fgets(a, 100, stdin);
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fgets(b, 100, stdin);
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printf("%d\n", strcmp(a, b));
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return 0;
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}
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```
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# PPT第80页思考题
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```C
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#include <stdio.h>
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int (*seek(int (*pnt_row)[3]))[3]
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{
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int i = 0, (*ret_row)[3];
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ret_row = pnt_row + 1;
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for (; i < 3; i++) {
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if (pnt_row[0][i] < 60) {
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ret_row = pnt_row;
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break;
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}
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}
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return ret_row;
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}
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int main()
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{
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int grade[3][3] = { { 55, 65, 75 }, { 65, 75, 85 }, { 75, 80, 90 } };
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int i, j, (*pointer)[3];
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for (i = 0; i < 3; i++) {
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pointer = seek(grade + i);
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if (pointer == grade + i) {
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printf("No. %d grade list: ", i + 1);
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for (j = 0; j < 3; j++) {
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printf("%d ", pointer[0][j]);
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}
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printf("\n");
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}
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}
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}
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```
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