fgets | 易学教程

fgets maximum size read

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问题 Using fgets to input a string, I have doubts related to length of string read. For example, consider the following program. char str[50]; int i; int len; printf("Enter name:\n"); fgets(str,11,stdin); len = strlen(str); printf("len : %d\n",len); If I enter 123456789 , strlen gives 10. If I enter 1234567890 , strlen given is 10 again ?? I think strlen is considering newline also for string length. Am I correct? (I understand fgets using newline as part of string) What's wrong with (2) where I

Easiest way to read this line of text into a struct?

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问题 I have a text file with data in the form: Lee AUS 2 103 2 62 TRUE Check AUS 4 48 0 23 FALSE Mills AUS 8 236 0 69 FALSE I need to each line into a struct like, however I'd like to avoid using fixed length arrays (the problem with fgets as far as I can tell): struct Data { char *sname; char *country; int *a; int *b; int *c; int *d; char *hsisno; }; I am very new to C. Should I use fscanf, or fgets? 回答1: fscanf stands for "file scan formatted " and user data is about as unformatted as you can

Detecting EOF with fgets() where filesteam is stdin

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问题 Bit of background, I'm writing a program that plays the game "boxes" it runs in linux command line and is written in C. There's a prompt that waits for user input and then is read with fgets() and interpretted etc. As part of the task specification I have to return a specific error if I reach "End of file while waiting for user input". I understand that fgets() returns null when it reaches EOF... but say I have fgets(input,max_buffer,stdin); in a prompt loop if the user exits prematurely say

How to implement gets() or fgets() while using structure pointer?

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The below code runs perfectly with scanf() , but i want to input characters along with white space. I have tried gets() and fgets() (commented below), but its not working (its skipping to next iteration in the loop & displaying blank(NULL) during output for Name input used by fgets() ). Any idea how to do it? PS: I've tried fputs() with sample programs, its working fine. But i am little confused while using structure pointer. #include <stdio.h> #include <stdlib.h> struct details { uint Id; char Name[20]; }; int main() { int tot, i; struct details *info; printf("Enter no. of details to be

Why aren't scanf(“%[^\n]\n”); and scanf(“%[^\n]%*c”); clearing a hanging newline?

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问题 After a call to scanf("%d", &variable); we are left with a newline hanging at the stdin , which should be cleared before a call to fgets , or we end up feeding it a newline and making it return prematurely. I've found answers suggesting using scanf("%*[^\n]%*c"); after the first call to scanf to discard the newline and others suggesting using scanf("%*[^\n]\n"); . Theoretically, both should work: The first would consume everything that isn't a newline (but not including the newline itself)

What does fgets do?

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问题 It is not equal: fgets (answer, 256, stdin); if (strncmp(answer, "sta", 4) == 0) printf("omg, it's equal"); This code is: fgets (answer, 4, stdin); if (strncmp(answer, "sta", 4) == 0) printf("omg, it's equal"); Why? It is because in the first, answer doesn't have \0 at the 4th place I guess (if I change it to 3 instead of 4 it works). But what does fgets do? String answer in the first is str \whitespace*253\0" ? And in the second it is str\0 ? Thank you. 回答1: fgets (unlike gets ) includes the

Paypal IPN Script, issue with feof and fgets

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问题 I've been having issues with my Paypal IPN listener script for a couple of days now. For those of you who are unfamiliar with the Paypal IPN system, basically Paypal sends your script with a message about the transaction, which you send back with a couple of bits added. If Paypal receives the correct reply, it'll reply with 'VERIFIED', and if not it'll say 'INVALID'. I initially thought that the problem I was experiencing was with the 'fsockopen' command: $fp=fsockopen('ssl://sandbox.paypal

How to use fgets() and store every line of a file using an array of char pointers?

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I wrote the program below in order to read every line of the file and then store each line in a array of char pointers for later use (like sorting only the pointers not the real strings). But the problem is that it keeps storing the same line. Lets say that the file is called file.txt and has two(2) lines with text. first sentence second sentence The code I wrote is the following: #include <stdio.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include <unistd.h> int main(){ FILE *cf; cf = fopen("file.txt", "r"); char line[101]; char *lines[2]; char *eof; int i=0; while((eof =

Easiest way to read this line of text into a struct?

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I have a text file with data in the form: Lee AUS 2 103 2 62 TRUE Check AUS 4 48 0 23 FALSE Mills AUS 8 236 0 69 FALSE I need to each line into a struct like, however I'd like to avoid using fixed length arrays (the problem with fgets as far as I can tell): struct Data { char *sname; char *country; int *a; int *b; int *c; int *d; char *hsisno; }; I am very new to C. Should I use fscanf, or fgets? paxdiablo fscanf stands for "file scan formatted " and user data is about as unformatted as you can get. You should never use naked "%s" format strings on data where you don't have absolute control

C structure not scanning all the inputs

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I have this C code: #include "stdio.h" main() { struct books { char name[100],author[100]; int year,copies; }book1,book2; printf("Enter details of first book\n"); gets(book1.name); gets(book1.author); scanf("%d%d",&book1.year,&book1.copies); printf("Enter details for second book\n"); gets(book2.name); gets(book2.author); scanf("%d%d",&book2.year,&book2.copies); printf("%s\n%s\n%d\n%d\n",book1.name,book1.author,book1.year,book1.copies); printf("%s\n%s\n%d\n%d\n",book2.name,book2.author,book2.year,book2.copies); } What is happening here is that it only scans till the author name of the second