Programming

B17 -> B19	 [label="{10}"];
B17 -> B21	 [label="{4}"];
B18 -> B19	 [label="{4}"];

void foo( char *src, char *behind, char *infront)
{
    char *p=strstr(src,"->");
    *infront=*behind=0x0;  // initialize to empty
    if(p!=NULL)
    {
         char *q=p;
         q-=4;                 // go four positions backward
         memcpy(behind, q, 3);
         behind[3]=0x0;  // mark the end of the string
         q=p;
         q+=4;
         memcpy(infront, q, 3);
         infront[3]=0x0;
    }
}

#include<stdio.h>
int main() {
  	char ch, file_name[25];
 	char wordChoice[2]="->";
 	int count=0,z=0,i=0;
    	FILE *fp;
 	char *a[100];
        fp = fopen("mergesort1.txt","r");
        if( fp == NULL )    {
       perror("Error while opening the file.\n");
           }

      printf("The contents of %s file are :\n", file_name);
      char buffer[2024]; //Sorry for this.

      while(fgets(buffer, 2024, fp) != NULL)
      {
               if(z==1)
               {
                       printf("%s",buffer);
                       z=0;
               }
               if(strstr(buffer, wordChoice))
               {count++; 		z=z+1;   }
          }
      fclose(fp);
   	printf("count:%d \n",count); 	 	  }

char prev_buf[2024];

 while(fgets(...))
 {
   ... your code here ...
   strcpy(prev_buf, buffer); 
 }

 
 if(strstr(...)) { printf("%s\n", prev_buf); up your counts etc }