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c++freadfloating

C/C++ read binary files (flaot numbers) at one time

I was wondering is there a way to speed up fread in C or C++? For example, if I want to read a binary file containing 100 4-byte float numbers. I do:

float *data=(float*)calloc(sizeof(float), 100);
float datatmp=0.0;
f=fopen("datafilename","rb");
for(int i=0;i<100;i++){
   fread(&datatmp,4,1,f);
   data[i]=datatm;
}
flcose(f);

My question is: can I read all the 100 float numbers at one time and put them in the data array? Will this be faster than using a loop?

Thanks.

Solution

  • you can read all one time. fread(data,sizeof(float)*100,1,f);