CODEWITHSUNDEEP
cscanf
WantToKnowMath
WantToKnowMath

Reputation: 63

What is does the fscanf() format string "%30[^$]" do in C?

What does this format string do? 

fscanf("%30[^$]");

I don't have any idea what it does, and will be so happy for an explanation of it.

Upvotes: 0

Views: 339

Answers (2)

Kristina Woods
Kristina Woods

Reputation: 13

fscanf reads the data from the stream and stores it based on the parameters. As weathervane stated your code shows max length unless $ is found. You are missing a place to store it. You may find http://www.cplusplus.com/reference/cstdio/fscanf/ useful. It shows how to format fscanf and what different specifiers like % and ^ mean.

Upvotes: 0

Weather Vane
Weather Vane

Reputation: 34585

30 is the maximum input length of a string, unless '$' is found.

That is for a string, from a file, but you have no target string or file. Perhaps

char str[31];
FILE *fil = fopen("myfile.txt", "rt");
if(fil == NULL) { /* error */ }
if(fscanf(fil, "%30[^$]", str) != 1)  { /* error */ }

Upvotes: 1

Related Questions