For example: int a, float b; But it’s wrong. Actually, I want to use it in the for loop. Just like this: for (int a, float b; a < 1; a++) { } I can use for loops to simplify mutex like this #define in_mutex_env(val) for(int __x = ({mutex_lock(); 0}); __x < 1; __x++, mutex_unlock())… Read More How to declare multiple different type variables in one line in C language
I want to write a program that accepts three arguments from the command line. Two arguments are numbers while one argument is one of the operations. The main function should read these arguments, if the number of arguments is not 3, then the program should return the value -9999 and exit. If the number of… Read More I had just started learning programming in C language and I faced a simple problem, but I didn't know how to implement it
I want to write a program that accepts three arguments from the command line. Two arguments are numbers while one argument is one of the operations. The main function should read these arguments, if the number of arguments is not 3, then the program should return the value -9999 and exit. If the number of… Read More I had just started learning programming in C language and I faced a simple problem, but I didn't know how to implement it
Im new to C and coding in general so, sorry if this issue is super easy to solve but. I cannot print called float type variables into new functions. INT type variables i can print but float just does not want to print its value when called into a new function. First i tried to… Read More Cannot print called float variables
I accidentally noticed that the following snipped of code compiles under GCC: void myFunction(void) { int i, y = 0; for (i = 0; i < 10; i++) y++; while (y); } I’ve never encountered such a piece of code before and wasn’t able to find any information about such a construct after doing some… Read More Confusing for… while loop syntax in C
Is there a way to assign values in an array of arrays? Specifically, I have written the following code: #include <stdio.h> #include <stdlib.h> void func(int **A){ //A: address of (address of pointer) int i; *A=(int *)malloc(5*sizeof(int)); //*A: address of pointer for (i=0;i<5;i++){ **A=i; //**A: content } } int main(){ int *k, i; func(&k); for (i=0;i<5;i++){… Read More How to assign values in an array of arrays properly?
I want to forward args of variadic function, I have already find the some topic. Forward an invocation of a variadic function in C When I start to practice, I found a problem. #include <stdio.h> #include <stdarg.h> void fun1(const char *msg, …) // try to forward printf { va_list arg_list; va_start(arg_list, msg); vprintf(msg, arg_list); va_end(arg_list);… Read More forward args of variadic function in C
Suppose that we have int arr[3]; char str[20] = "{10,20,30}"; Is it possible to initialise arr with str? >Solution : Not statically, you would need to parse the string and then assign the parsed values to arr. You can parse numbers (and more) from strings with sscanf or with strtol (just parsing integers). One way… Read More Is there a way to initialise array of integers with string?
I want to modify some vowels of a file by "5". The following code works. However i do not understand why should I put fseek twice. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <ctype.h> void print_file_contents(const char *filename) { FILE *fp; char letter; if((fp=fopen(filename,"r+"))==NULL) { printf("error\n"); exit(1); } fseek(fp,0,SEEK_END); int size=ftell(fp); rewind(fp); for(int i=0;i<size;i++) {… Read More Why should i put SEEK_SET twice
I am getting this segmentation error and I can seem to find where it is occuring. I am trying to create a list of float values through an array of floats. It is one of my assignment from college class. my code I have tried to comment out the float array all together to see… Read More Exception has occured. Segmentation Fault