编写一个 C 程序来查找现有文件中的行总数
以读取模式打开文件。如果文件存在,编写代码以计算文件中行数。如果文件不存在,显示文件不存在错误。
文件是集合记录(或)它是硬盘上的数据永久存储的地方。
文件执行的操作如下
文件命名
打开文件
读取文件
写入文件
关闭文件
语法
打开和命名文件的语法如下
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");程序 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;
}输出
Total number of lines are: 3 Note: employee details.txt file consist of Pinky 20 5000.000000 Here total number of line are 3
程序 2
在这个程序中,我们将演示如何在文件中找到文件夹中没有的总行数。
#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;
}输出
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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