63.當當網txt數據按行切割與合並
阿新 • • 發佈：2018-02-10
分割 scanf 寫入文件 宏定義 == pause clas class alloc
- 獲取文件有多少行
1 //獲取文件有多少行 2 int getN(char *path) 3 { 4 FILE *pf = fopen(path, "r"); 5 if (pf==NULL) 6 { 7 return -1; 8 } 9 else 10 { 11 int i = 0; 12 while (!feof(pf)) 13 { 14 char str[256] = { 0 }; 15 fgets(str, 256, pf);
16 i++; 17 } 18 fclose(pf); 19 return i; 20 } 21 } - 宏定義行數
1 //數據的行數 2 #define N 13180820
- 文件按行切割
1 //文件切割 2 void space(char *path, int num) 3 { 4 char ** pathes = malloc(sizeof(char*)*num); 5 for (int i = 0; i < num;i++) 6 { 7 pathes[i] = malloc(sizeof
(char) * 256); 8 //格式化處理文件名 9 sprintf(pathes[i], "dangdangwang%d.txt", i + 1); 10 } 11 12 //打開文件 13 FILE *pf = fopen(path, "r"); 14 15 if (pf == NULL) 16 { 17 return -1; 18 } 19 else 20 { 21 //如果能被整除 22 if (N%num == 0) 23 {24 for (int i = 0; i < num;i++) 25 { 26 //寫入文件 27 FILE *pfw = fopen(pathes[i], "w"); 28 for (int j = 0; j < N / num; j++) 29 { 30 char str[1024] = { 0 }; 31 //讀取一行寫入一行 32 fgets(str, 1024, pf); 33 fputs(str, pfw); 34 } 35 fclose(pfw); 36 } 37 } 38 else 39 { 40 for (int i = 0; i < num - 1; i++) 41 { 42 //寫入文件 43 FILE *pfw = fopen(pathes[i], "w"); 44 //處理前面n-1個 45 for (int j = 0; j < N / (num-1); j++) 46 { 47 char str[1024] = { 0 }; 48 //讀取一行寫入一行 49 fgets(str, 1024, pf); 50 fputs(str, pfw); 51 } 52 fclose(pfw); 53 54 } 55 56 { 57 //處理剩下的 58 //寫入 59 FILE *pfw = fopen(pathes[num-1], "w"); 60 for (int j = 0; j < N %(num-1); j++) 61 { 62 char str[1024] = { 0 }; 63 //讀取一行寫入一行 64 fgets(str, 1024, pf); 65 fputs(str, pfw); 66 } 67 fclose(pfw); 68 } 69 } 70 fclose(pf); 71 } 72 } - 文件合並
1 //合並文件 2 void merge(char *newpath,int n) 3 { 4 char ** pathes = malloc(sizeof(char*)*n); 5 for (int i = 0; i < n; i++) 6 { 7 pathes[i] = malloc(sizeof(char) * 256); 8 sprintf(pathes[i], "dangdangwang%d.txt", i + 1); 9 } 10 11 12 //寫入文件 13 FILE *pf = fopen(newpath, "w"); 14 if (pf == NULL) 15 { 16 return -1; 17 } 18 else 19 { 20 //依次讀取每個文件 21 for (int i = 0; i < n;i++) 22 { 23 FILE *pfr = fopen(pathes[i], "r"); 24 25 while (!feof(pfr)) 26 { 27 char str[1024] = { 0 }; 28 //讀取一行寫入一行 29 fgets(str, 1024, pfr); 30 fputs(str, pf); 31 } 32 fclose(pfr); 33 } 34 fclose(pf); 35 } 36 }
- 測試函數
1 void main() 2 { 3 //int num = getN(path); 4 //printf("%d", num);獲取行數 5 int num; 6 scanf("%d", &num); 7 8 //分割 9 space(path, num); 10 //合並 11 merge(newpath, num); 12 13 system("pause"); 14 }
完整代碼:
1 #define _CRT_SECURE_NO_WARNINGS 2 #include <stdio.h> 3 #include <stdlib.h> 4 char *path = "dangdangwang.txt"; 5 char *newpath = "dangdangwangN.txt"; 6 7 //數據的行數 8 #define N 13180820 9 10 //獲取文件有多少行 11 int getN(char *path) 12 { 13 FILE *pf = fopen(path, "r"); 14 if (pf==NULL) 15 { 16 return -1; 17 } 18 else 19 { 20 int i = 0; 21 while (!feof(pf)) 22 { 23 char str[256] = { 0 }; 24 fgets(str, 256, pf); 25 i++; 26 } 27 fclose(pf); 28 return i; 29 } 30 } 31 32 //文件切割 33 void space(char *path, int num) 34 { 35 char ** pathes = malloc(sizeof(char*)*num); 36 for (int i = 0; i < num;i++) 37 { 38 pathes[i] = malloc(sizeof(char) * 256); 39 //格式化處理文件名 40 sprintf(pathes[i], "dangdangwang%d.txt", i + 1); 41 } 42 43 //打開文件 44 FILE *pf = fopen(path, "r"); 45 46 if (pf == NULL) 47 { 48 return -1; 49 } 50 else 51 { 52 //如果能被整除 53 if (N%num == 0) 54 { 55 for (int i = 0; i < num;i++) 56 { 57 //寫入文件 58 FILE *pfw = fopen(pathes[i], "w"); 59 for (int j = 0; j < N / num; j++) 60 { 61 char str[1024] = { 0 }; 62 //讀取一行寫入一行 63 fgets(str, 1024, pf); 64 fputs(str, pfw); 65 } 66 fclose(pfw); 67 } 68 } 69 else 70 { 71 for (int i = 0; i < num - 1; i++) 72 { 73 //寫入文件 74 FILE *pfw = fopen(pathes[i], "w"); 75 //處理前面n-1個 76 for (int j = 0; j < N / (num-1); j++) 77 { 78 char str[1024] = { 0 }; 79 //讀取一行寫入一行 80 fgets(str, 1024, pf); 81 fputs(str, pfw); 82 } 83 fclose(pfw); 84 85 } 86 87 { 88 //處理剩下的 89 //寫入 90 FILE *pfw = fopen(pathes[num-1], "w"); 91 for (int j = 0; j < N %(num-1); j++) 92 { 93 char str[1024] = { 0 }; 94 //讀取一行寫入一行 95 fgets(str, 1024, pf); 96 fputs(str, pfw); 97 } 98 fclose(pfw); 99 } 100 } 101 fclose(pf); 102 } 103 } 104 105 //合並文件 106 void merge(char *newpath,int n) 107 { 108 char ** pathes = malloc(sizeof(char*)*n); 109 for (int i = 0; i < n; i++) 110 { 111 pathes[i] = malloc(sizeof(char) * 256); 112 sprintf(pathes[i], "dangdangwang%d.txt", i + 1); 113 } 114 115 116 //寫入文件 117 FILE *pf = fopen(newpath, "w"); 118 if (pf == NULL) 119 { 120 return -1; 121 } 122 else 123 { 124 //依次讀取每個文件 125 for (int i = 0; i < n;i++) 126 { 127 FILE *pfr = fopen(pathes[i], "r"); 128 129 while (!feof(pfr)) 130 { 131 char str[1024] = { 0 }; 132 //讀取一行寫入一行 133 fgets(str, 1024, pfr); 134 fputs(str, pf); 135 } 136 fclose(pfr); 137 } 138 fclose(pf); 139 } 140 } 141 142 143 void main() 144 { 145 //int num = getN(path); 146 //printf("%d", num);獲取行數 147 int num; 148 scanf("%d", &num); 149 150 //分割 151 space(path, num); 152 //合並 153 merge(newpath, num); 154 155 system("pause"); 156 }
63.當當網txt數據按行切割與合並