Hi,
I have to find the ‘position’ of ‘23’ in file a1.txt. At the corresponding ‘position’
in a2.txt, I want to add 500 to member value. I am able to pick up the values from both a1.txt and a2.txt but the problem comes when I a trying to replace the value in a2.txt by adding 500 to the corresponding member value. The value is not getting printed in a2.txt.
I am using gcc compiler. Kindly help..
a1.txt:
11
12
13
....
23
24
25
a2.txt:
61
62
63
...
73
74
75
Code:#include<stdio.h> int main() { FILE *fp,*fp1; int i,ch; long n; fp1=fopen("a1.txt","r"); while(fscanf(fp1,"%d",&i) == 1) { if(i==23) { n=ftell(fp1); printf("%ld\n",n); break; } } fclose(fp1); n=n-2; //offset starts with '0' fp=fopen("a2.txt","rw"); fseek(fp,n,0); fscanf(fp,"%d",&i); fprintf(fp,"%d\n",i+5); fclose(fp); return 0; }
