How to read the two lines of character data between begin and end in a TXT document in C language

How to read the data between two lines of characters in a TXT document in C language, such as between begin and end

Assume the file structure is: 1E1F 0309 luan7 8 zao

2E2F 1518

begin

12 39692

12 39712

9 39724

end

begin

14 39692

8 39724

end

luan7 8 zao

qi qi guai guai

begin

312 39692

142 39712

95 39724

end

Contains multiple segments of begin, end data

#include #include

main( ) {

FILE *fin;

int a[1000],b[1000],n=0,i;

char one_line[80];

fin=fopen("abc.txt","r");

if (fin==NULL){printf(＂open file error\n＂);return 0;}

Lab1:while(1){

if ( fgets(one_line,80,fin)==NULL){

printf(＂Can not fund begin any more\n＂);goto Lab2;}

if (strncmp(one_line,"begin",5)==0)break;

}

for (i=0;i

if (strncmp(one_line,"end",3)==0)break;

sscanf(one_line,"%d %d",&a[n],&b[n]);

n ;

}

goto Lab1;

Lab2: fclose(fin);

printf("I read:\n");for (i=0;ireturn 0;

}

What to do if the data is extracted from txt in C language and separated by semicolons

fgets reads each line of data and then uses strchr to find the position where semicolon; appears, and then performs the corresponding conversion!

This is an example I wrote to read a specified string. You can refer to this and modify it. The string to floating point number function atof

#include

#include

#define N 10

int readstr(const char* str,char p[][128],int plen,int savepos);

int main()

{

char str[]=＂2012/10/12;123456.0;456123.0＂;

char date[N][128]={0};

int len=readstr(str,date,N,0);

for (int i=0;i

{

printf(＂%s\n＂,date[i]);

}

return 0;

}

int readstr(const char* str,char p[][128],int plen,int savepos)

{

if(plen

{

printf ("The array is too small, please change the storage location!");

return 0;

}

static int len=0;

char *find=strchr(str,';');

if(find==NULL)

{

strcpy(p[savepos],str);

len ;

return len;

}

else

{

strncpy(p[savepos],str,find-str);

len ;

readstr(find 1,p,N,len);

}

return len;

}

How to read the next line of data of a specified string in C language in txt

Use fgets to read a row, and use sscanf to read the first column of data

The following assumes that the first column of data is used as a string, and is read using sscanf(buf,＂%s＂,... format.

Similarly, use %d for integers and %f for floating points....

#include

#include

main(){

char buf[100];

char col[100][30];

int n=0;

FILE *fp = fopen("a.txt", "r");

while ( fgets(buf, 100, fp) != NULL) {

if (sscanf(buf,"%s",col[n]) == 1){printf("%s\n", col[n]); n ; };

}

return 0;

}

If you want to read the first number of each line, (only read one digit using format):

int x[100];

...

while ( fgets(buf, 100, fp) != NULL) {

if (sscanf(buf," ",&x[n]) == 1){ printf("%d\n",x[n]);n ;};

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