C Program - 'Junk value' appearing

[dharanidhar]

#include<stdio. h>
#include<math.h >

main()
{
FILE * fp;
struct
{
int a;
float b;
}file;
fp = fopen("Y.TXT"," w+");
printf("enter the value of a :");
scanf("%d",&fil e.a);
printf("\n");
file.b =sin(file.a);
printf("%d",fil e.a);
printf("\n");
printf("%f",fil e.b);
fwrite(&file,si zeof(file),1,fp );
fclose(fp);
}


i am getting some garbage value into the file.can you tell me what may be the problem?

[gpraghuram]

The junk is becos you write a float value to the file and u use fwrite to write the information.
If u use fwrite then use wb+ when opening the file.


Thanks
raghuram

[dharanidhar]

thank you for your reply

i have used wb+ as i am using fwrite.but i am getting the same junk value as before

i am using quincy C compiler

I could get the output in the file when i used fprintf()

[gpraghuram]

thank you for your reply

i have used wb+ as i am using fwrite.but i am getting the same junk value as before

i am using quincy C compiler

I could get the output in the file when i used fprintf()

Try to open the file after writing using fopen and reag the contents using fread.
If it is having proper value then it is not junk in the file.


Raghuram

[dharanidhar]

#include<stdio. h>
#include<math.h >

main()
{
FILE * fp;
int i;
int m[20];
struct
{
int a;
float b;
}file;
fp = fopen("Y.TXT"," wb");
printf("enter the value of a :");
scanf("%d",&fil e.a);
printf("\n");
file.b =sin(file.a);
printf("%d",fil e.a);
printf("\n");
printf("%f\n",f ile.b);
fwrite(&file,si zeof(file),1,fp );
fclose(fp);
fp = fopen("Y.TXT"," r");
fread(m,1,2,fp) ;
for(i = 0;i <= 1;i++)
printf("%d",*(m +i));
}

i have tried as u suggested me that is also giving junk value.......

[JosAH]

Please note that the 'junk value' happens to be the content of your structure in
binary form. Did you expect some textual representation of the int and float
values in your file? If so, don't use write but fprintf each struct member to the file.

kind regards,

Jos

[gpraghuram]

You should try opening the file in binary mode and when using fread use the same syntax what u have used for fwrite.
Then you will know its not a junk.

Raghu