編寫一個 C 程式來查詢現有檔案中的行總數
以讀取模式開啟檔案。如果檔案存在,編寫程式碼以計算檔案中行數。如果檔案不存在,顯示檔案不存在錯誤。
檔案是集合記錄(或)它是硬碟上的資料永久儲存的地方。
檔案執行的操作如下
檔案命名
開啟檔案
讀取檔案
寫入檔案
關閉檔案
語法
開啟和命名檔案的語法如下
1) FILE *File pointer; Eg : FILE * fptr; 2) File pointer = fopen ("File name", "mode"); Eg : fptr = fopen ("sample.txt", "r"); FILE *fp; fp = fopen ("sample.txt", "w");
程式 1
#include <stdio.h> #define FILENAME "Employee Details.txt" int main(){ FILE *fp; char ch; int linesCount=0; //open file in read more fp=fopen(FILENAME,"r"); if(fp==NULL){ printf("File \"%s\" does not exist!!!
",FILENAME); return -1; } //read character by character and check for new line while((ch=getc(fp))!=EOF){ if(ch=='
') linesCount++; } //close the file fclose(fp); //print number of lines printf("Total number of lines are: %d
",linesCount); return 0; }
輸出
Total number of lines are: 3 Note: employee details.txt file consist of Pinky 20 5000.000000 Here total number of line are 3
程式 2
在這個程式中,我們將演示如何在檔案中找到資料夾中沒有的總行數。
#include <stdio.h> #define FILENAME "sample.txt" int main(){ FILE *fp; char ch; int linesCount=0; //open file in write mode fp=fopen(FILENAME,"w"); printf ("enter text press ctrl+z of the end"); while ((ch = getchar( ))!=EOF){ fputc(ch, fp); } fclose(fp); //open file in read more fp=fopen(FILENAME,"r"); if(fp==NULL){ printf("File \"%s\" does not exist!!!
",FILENAME); return -1; } //read character by character and check for new line while((ch=getc(fp))!=EOF){ if(ch=='
') linesCount++; } //close the file fclose(fp); //print number of lines printf("Total number of lines are: %d
",linesCount); return 0; }
輸出
enter text press ctrl+z of the end Hi welcome to Tutorials Point C Pogramming Question & answers ^Z Total number of lines are: 2
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