How to Read a Structure of Records Into Array in C
C Exercises: Read the file and store the lines into an array
C File Handling : Practise-4 with Solution
Write a plan in C to read the file and shop the lines into an assortment.
Sample Solution:
C Code:
#include <stdio.h> #include <stdlib.h> #include <string.h> #ascertain LSIZ 128 #define RSIZ ten int main(void) { char line[RSIZ][LSIZ]; char fname[xx]; FILE *fptr = Zippo; int i = 0; int tot = 0; printf("\n\northward Read the file and store the lines into an array :\n"); printf("------------------------------------------------------\northward"); printf(" Input the filename to be opened : "); scanf("%s",fname); fptr = fopen(fname, "r"); while(fgets(line[i], LSIZ, fptr)) { line[i][strlen(line[i]) - one] = '\0'; i++; } tot = i; printf("\n The content of the file %southward are : \due north",fname); for(i = 0; i < tot; ++i) { printf(" %south\northward", line[i]); } printf("\north"); return 0; } Sample Output:
Read the file and store the lines into an array : ------------------------------------------------------ Input the filename to exist opened : test.txt The content of the file test.txt are : examination line i test line 2 test line three test line 4
Flowchart:
C Programming Code Editor:
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C Programming: Tips of the Solar day
C Programming - What is the difference between const int*, const int * const, and int const *?
Read it backwards (as driven past Clockwise/Spiral Dominion):
- int* - pointer to int
- int const * - pointer to const int
- int * const - const arrow to int
- int const * const - const arrow to const int
Now the first const tin can be on either side of the type so:
- const int * == int const *
- const int * const == int const * const
If y'all want to go really crazy you lot tin can do things like this:
- int ** - pointer to arrow to int
- int ** const - a const arrow to a arrow to an int
- int * const * - a pointer to a const arrow to an int
- int const ** - a pointer to a pointer to a const int
- int * const * const - a const pointer to a const pointer to an int
- ...
And to brand certain we are clear on the significant of const:
int a = v, b = x, c = 15; const int* foo; // pointer to constant int. foo = &a; // assignment to where foo points to. /* dummy statement*/ *foo = 6; // the value of a tin't go changed through the arrow. foo = &b; // the arrow foo can be changed. int *const bar = &c; // constant pointer to int // note, you really demand to prepare the pointer // here because you can't change it later ;) *bar = 16; // the value of c tin exist changed through the pointer. /* dummy argument*/ bar = &a; // not possible because bar is a constant pointer.
foo is a variable pointer to a abiding integer. This lets you change what you point to just not the value that you betoken to. Most often this is seen with C-style strings where yous take a pointer to a const char. Yous may change which cord yous indicate to but you can't change the content of these strings. This is of import when the string itself is in the data segment of a plan and shouldn't be inverse.
bar is a abiding or fixed arrow to a value that can be changed. This is like a reference without the extra syntactic sugar. Because of this fact, unremarkably y'all would utilize a reference where you would use a T* const pointer unless you need to permit NULL pointers.
Ref : https://chip.ly/39RctBb
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