C Peimer第11章编程习题

两天时间，15道题，看上去简单，做一下就知道每道都要命，眼睛都要废了……

//answers of the questions in the Peimer at Chapter 11#include <stdio.h>#include <string.h>#include <ctype.h>#include <math.h>#include <stdlib.h>#define LINES 4#define N 20int main(int argc,char *argv[]) {//1/*char chArr[N + 1];void strCopyMy(char *chArr,int n);strCopyMy(chArr, N);puts(chArr);*///2/*char chArr[N + 1];void strCopyMy_2(char *chArr, int n);char temp;strCopyMy_2(chArr, N);puts(chArr);*///3/*第二题的程序适用char chArr[N + 1];void strCopyMy_2(char *chArr, int n);char temp;strCopyMy_2(chArr, N);puts(chArr);*///4/*char chArr[2*N];char* strChMy(char *chArr, char ch);char ch;char *temp;int i = 0;printf("begin:\n");while (i < 10) {printf("please enter a line:\n");gets(chArr);printf("please enter a character:\n");ch = getchar();getchar();//除掉录入ch后的那一个\ntemp = strChMy(chArr, ch);printf("%c\n", *temp);puts(temp);i++;}*///5/*int is_within(char *chArr, char ch);char chArr[] = "I am a wonderful person!";char ch = 'k';int position;position = is_within(chArr, ch);printf("%d\n", position);*///6/*char* strncpyMy(char *str1, char* str2, int n);char *str1[2 * N];char *str2 = "this is a wonderful story!";strncpyMy(str1, str2, 2 * N);puts(str1);*///7/*char *string_in(char* chArr1,char *chArr2);char chArr1[] = "this is a wonderful story";char chArr2[] = "wonderful";char *same;same = string_in(chArr1, chArr2);puts(same);//以返回的指针处开始打印*///8/*void reverseChArr(char *chArr);//attention this function can only receive a string less than 4*N letters.char chArr1[] = "this is a wonderful story\n";char chArr2[4 * N];puts(chArr1);reverseChArr(chArr1);puts(chArr1);*///9/*char chArr1[4 * N];void deleteSpace(char *chArr);gets(chArr1);while (*chArr1 != ' '){deleteSpace(chArr1);puts(chArr1);gets(chArr1);}*///10/*char chArr[LINES][N];int choice;void ASCIIOrder(char*chArr[], int lines);//按ASCII码排列void FirstWordLengthOrder(char*chArr[][N], int lines);//按ASCII码排列void LengthOrder(char*chArr[], int lengthArr[],int lines);//按串长排列void showArray(char *chArr[], int lines);char *head[LINES];int lengthArr[LINES];for (int i = 0; i < LINES; i++){printf("please enter the %dth line:\n", i);gets(chArr[i]);head[i] = chArr[i];*(lengthArr + i) = strlen(chArr[i]);}int flag = 1;while (flag){printf("Please choose your option:\n");printf("1.output string：\n");printf("2.print according to the ascII order：\n");printf("3.print according to length：\n");printf("4.print according to the length of the first word：\n");printf("5.Quit：\n");scanf("%d", &choice);switch (choice){case 1:showArray(head, LINES);break;case 2:ASCIIOrder(head, LINES);showArray(head, LINES);break;case 3:LengthOrder(head, lengthArr, LINES);showArray(head, LINES);break;case 4:FirstWordLengthOrder(head, LINES);showArray(head, LINES);break;case 5:flag = 0;break;default:break;}}*///11/*char chArr[4 * N];char temp;int Upper = 0;int Lower = 0;int Punct = 0;int Num = 0;int total = 0;int i = 0;while ((temp = getchar()) != EOF){if (temp >= 'A'&&temp <= 'Z'){Upper++;}else if (temp >= 'a'&&temp <= 'z'){Lower++;}else if (ispunct(temp)){Punct++;}else if (temp >= '0'&&temp <= '9')//判断数字也得用ASCII码！{Num++;}*(chArr + i) = temp;i++;}*(chArr + N - 1) = '\0';puts(chArr);printf("\nthe number of upper letters is %d;\n", Upper);printf("the number of lower letters is %d;\n", Lower);printf("the number of Punct letters is %d;\n", Punct);printf("the number of Num letters is %d;\n", Num);*///12//此题写的是相当不好！！！//运行此程序需在cmd下运行，需几个参数(小于LINES)/*//const char *mytal[LINES] = { "adding name swiftly","multiply quickly","following instructions ","understand the C"};char mytal[LINES][4 * N];char *temp[LINES];char *temp2[LINES];void ReverseWord(char* chArr[],char *temp2[],int lines);for (int i = 0; i < argc; i++){strcpy(mytal[i], argv[i]);}for (int i = 0; i < LINES; i++){temp[i] = mytal[i];puts(temp[i]);}printf("**************\n");ReverseWord(temp,temp2,LINES);for (int i = 0; i < LINES; i++){puts(temp2[i]);}*///13//调用ctype.h中的函数strtod();/*double bottom;int index;double reNum;bottom = atof(argv[1]);index = atoi(argv[2]);reNum = pow(bottom, index);printf("the result is %lf", reNum);*///14/*int AtoIMy(char *chArr[],int lines);char chArr[2 * N] = "this is 123 huge456 news!";int num;num = AtoIMy(chArr, 2 * N);puts(chArr);printf("%d",num);*///15//本例亦需在cmd下运行，需参数-p或-u或-lchar *chArr[4 * N];int choice = 0;void ToUpperMy(char *chArr);void ToLowerMy(char *chArr);//printf("%s", argv[1]);if (!strcmp(argv[1], "-p")){choice = 0;}else if (!strcmp(argv[1], "-u")){choice = 1;}else if (!strcmp(argv[1], "-l")){choice = 2;}printf("your choice is : %d\n",choice);printf("Please enter a line:\n");gets(chArr);switch (choice){case 0:puts(chArr);break;case 1:ToUpperMy(chArr);puts(chArr);break;case 2:ToLowerMy(chArr);puts(chArr);break;default:break;}return 0;}void ToLowerMy(char *chArr) {int i = 0;while (*chArr) {*chArr = tolower(*chArr);chArr++;}}void ToUpperMy(char *chArr) {int i = 0;while (*chArr) {*chArr = toupper(*chArr);chArr++;}}int AtoIMy(char chArr[],int lines) {int num = 0;int counter=0;int times10;for (int i = 0; i < lines; i++){if (chArr[i] >= '0'&&chArr[i] <= '9'){num = num * 10 + (int)(chArr[i]-'0');counter++;}else if ((chArr[i] >= '9' || chArr[i] <= '0')&&counter != 0)//在进入数字后遇符号跳出{break;}}return num;}void ReverseWord(char* chArr[], char *temp[], int lines) {for (int i = 0; i < LINES; i++){temp[i] = chArr[LINES - i-1];}}void FirstWordLengthOrder(char *chArr[], int lines) {void LengthOrder(char *chArr[], int lengthArr[], int lines);int temp[LINES];for (int i = 0; i < lines; i++){for (int j = 0; j < N; j++){if (*(*(chArr + i) + j) == ' '|| *(*(chArr + i) + j) == '\0'){*(temp + i) = j;break;}}}LengthOrder(chArr, temp, lines);}void showArray(char *chArr[], int lines) {for (int i = 0; i < lines; i++){puts(chArr[i]);}}void LengthOrder(char *chArr[], int lengthArr[], int lines) {//按串长排列int max;char *temp;int midNum;for (int i = 0; i < lines - 1; i++){max = *(lengthArr + i);for (int j = i + 1; j < lines; j++){if (max<*(lengthArr+j)){max = *(lengthArr + j);//交换串长midNum = *(lengthArr + j);*(lengthArr + j) = *(lengthArr + i);*(lengthArr + i) = midNum;//交换地址temp = *(chArr + j);*(chArr + j) = *(chArr + i);*(chArr + i) = temp;}}}}void ASCIIOrder(char *head[],int lines) {char *temp;for (int i = 0; i < lines - 1; i++){for (int j = i + 1; j < lines; j++){if (strcmp(head[i], head[j]) > 0){temp = head[i];head[i] = head[j];head[j] = temp;}}}}void deleteSpace(char *chArr) {int length;length = strlen(chArr);for (int i = 0; i < length; i++){if (*(chArr + i) == ' ') {for (int j = i; j < length; j++){*(chArr + j) = *(chArr + j + 1);//向前提一个，一直到length+1=='\0'}}}}void reverseChArr(char *chArr) {int length;int i = 0;char copyArr[4 * N];length = strlen(chArr);strncpy(copyArr, chArr, length + 1);while (*(copyArr+i)!='\0'){*(chArr + i) = *(copyArr + length - 1 - i);//reverse the sentence! i++;}}char *string_in(char* chArr1, char *chArr2) {char *same = "\0";int length1, length2;length1 = strlen(chArr1);length2 = strlen(chArr2);if (length1 > length2) {for (int i = 0; i < length1 - length2 + 1; i++) {if (strncmp(chArr1+i, chArr2,length2) == 0)//仅截取length2长度以比较{same = chArr1 + i;break;}}}return same;}char* strncpyMy(char *str1, char* str2, int n) {for (int i = 0; i < n; i++){if (*(str2 + i) != '\0') {//判断str2是否完结*(str1 + i) = *(str2 + i);}else {*(str1 + i) = '\0';break;}}return str1;}int is_within(char *chArr, char ch) {int i = 0;int flag = 0;while (*(chArr + i) != '\0'){if (*(chArr + i) == ch) {flag = i + 1;break;}i = i++;}return flag;}char* strChMy(char *chArr,char ch) {//找含第二个参数字符在第一个参数内第一次出现的指针int i = 0;char *temp = "";while (*(chArr + i) != '\0'){if (*(chArr + i) == ch) {temp = (chArr + i);break;}i = i++;}return temp;}void strCopyMy_2(char *chArr, int n) {char temp;for (int i = 0; i < n; i++){if ((temp = getchar())!= ' ' && temp!='\n' && temp!='\t')//判断是否为所避关键字{*(chArr + i) = temp;}else {//如果是特殊字符，立刻结尾，破出chArr[i] = '\0';break;}}chArr[N] = '\0';//将最后一位给结束字符以免乱码！}void strCopyMy(char *chArr,int n) {//fgets(chArr, n, stdin);//fgets更安全！for (int i = 0; i < n; i++){*(chArr + i) = getchar();}chArr[N] = '\0';//将最后一位给结束字符以免乱码！}