Advertisements When using a int to float implicit conversion, it fails with printf() #include <stdio.h> int main(int argc, char **argv) { float s = 10.0; printf("%f %f %f %f\n", s, 0, s, 0); return 0; } when compiled with gcc -g scale.c -o scale it does output garbage ./scale 10.000000 10.000000 10.000000 -5486124068793688683255936251187209270074392635932332070112001988456197381759672947165175699536362793613284725337872111744958183862744647903224103718245670299614498700710006264535590197791934024641512541262359795191593953928908168990292758500391456212260452596575509589842140073806143686060649302051520512.000000 If I… Read More Why is int to float conversion failing in printf?

Advertisements The below will raise compilation warning warning: unknown conversion type character ‘w’ in format [-Wformat=] on a new version of gcc: gcc (Debian 12.2.0-14) 12.2.0 #include <stdio.h> int main() { char query[4096]; snprintf(query, sizeof(query), "SELECT e.expression_id, e.name, e.channel, e.subsidiary_of, ds.input_channel FROM expression e " " JOIN shoe s ON s.shoe_id = e.shoe_id JOIN device_serial… Read More GCC does not recognize escape character '\' on multi-line input

Advertisements I am trying to learn C, but for some reason my program doesn’t want to print letters. It can print everything else like integers and floats just fine. It doesn’t give me an error as well, it just skips over the line where the character should be. I tried simply printing out the letter… Read More My program can't print a single-character string

Advertisements #include <stdio.h> int b; int main() { int a, c; printf("Enter the number of students \n"); scanf("%d", &a); struct studinfo{ char name[50]; int roll; float marks; }; struct studinfo s[10]; for(int i = 0; i <= a; i++) { printf("Enter the Name :\n"); scanf("%[^\n]s", s[i].name); //THIS ONE HERE printf("\n"); printf("Enter the roll no. \n");… Read More The scanf to get "name" skips itself when i execute it. What changes do I make inorder for it to no do that?

Advertisements I have written a piece of code that I am using to research the behavior of different libraries and functions. And doing so, I stumbled upon some strange behavior with sscanf. I have a piece of code that reads an input into a buffer, then tries to put that value into a numeric variable.… Read More Why is sscanf behaving like this when converting hex strings to number?

Advertisements I just discovered a very weird trick that the c compiler is doing, it’s a very simple code I tried it in many online c compilers but the result is the same, which is driving me insane. #include <stdio.h> int main() { char Buffer[10] = "0123456789"; char ID[5] = "abcde"; printf("%s",ID); return 0; }… Read More C weird printf behavior

Advertisements I found questions about %i and %d on here, but all of them seemed to claim that they were the same in printf. Compiler: Apple clang version 12.0.5 (clang-1205.0.22.9) Note: 15 is 017 in octal and 0xf in hexidecimal. I was previously under the impression that %d and %i only differed when used during… Read More Differing output with printf using %d and %i

Advertisements I am using scanf to get an input. But when I run this code: #include<stdio.h> int main(){ unsigned char in,b; scanf("%u %u",&in,&b); printf("%u %u\n",in,b); return 0; } when I input, for example, 12 3 , the output is 0 3. This also happends when I instead of scanf("%u %u",&in,&b); write scanf("%u",&in);scanf("%u",&b);. Thanks for reaching… Read More Why does scanf set the first value to 0?

Advertisements I am beginner in C. I have been writing a program code to find largest element in Array. Passed Value is not able to store in array of type: float. Instead default Value:0 is being stored. What to do? #include<stdio.h> // Largest Element int main() { int n,i; float arr[100]; printf("Enter Element Count in… Read More Default element value is used instead of user defined in C?

Advertisements I’ve been trying to scan integers with sscanf() from strings with leading zeros (e.g. ’03’). However, it works fine but only until ’07’. Starting with ’08’, the strings will be read as 0. Below you’ll find my code and the output. Thank you for your help! #include <stdio.h> #include <stdlib.h> int main() { char… Read More sscanf does not work properly for eight and nine with leading zero