cs50

I am very new to C. I come from a python background. I would like to know where I went wrong with my code. I am doing the cs50 greedy problem. What is wrong with my code? It works with some numbers but others don't work. I am trying to get an input from the user asking how much change to give back, then calculate the minimum number of coins I can give back using only $.25, $.10, $.05, $.01 #include <cs50.h> #include <stdio.h> int main(void) { float n; do { n = get_float("How much change is owed?\n"); } while(n == EOF); int minimumamountofcoins = 0; if (n/.25 >=1){ do { n -= .25;

I am taking a MOOC course CS50 from Harvard. The last lecture I had was about memory allocation and pointers (two concepts which are absolutely new to me). What was taught is that malloc(10*sizeof(char)) allocates enough bytes on the heap to store 10 characters and returns a pointer to the first byte which can be saved in another variable as follows char *x = malloc(10*sizeof(char)) . To free the memory one would use free(x) . But there is another way to make a computer to reserve enough memory to store 10 characters i.e. char c[10] . Is in the code snippet above c also a pointer of type char*

I am using 64 bit operating system ,then also i am not able to print 46th fibonacci number correctly which is less than 4 billion. #include<cs50.h> #include<stdio.h> int main(void) { unsigned int n=50; int array[n]; array[0]=0; array[1]=1; printf("%i\n",array[0]); printf("%i\n",array[1]); for(int i=2;i<n;i++) { array[i]=array[i-1]+array[i-2]; printf("%i\n",array[i]); } You have to use long long as your data type of the array. because You are going to store out-range numbers of the integer range.(-2,147,483,648 to 2,147,483,647) And declaration of int i should be before the for loop. #include

I have run this program and get the error expression result unused. I may be doing something simple wrong, but I have spent the day trying to figure it out to no avail. Any help you can provide is greatly appreciated. #include <stdio.h> #include <cs50.h> int main() { int x, y = 0; printf("Enter the amount of change "); x = GetFloat() * 100; while (x != 0) { if (x >= 25) { x - 25; y = y + 1; } if (x >= 10 && x < 25) { x - 10; } y = y + 1; if (x >= 5 && x < 10) { x - 5; } y = y + 1; if (x >= 1 && x < 5) { x - 1; y= y + 1; } } printf("The number of coins neccessary is %d", y); } if (x >= 25) { x

I'm getting some problems on compiling a very very simple name.c file on Mac OSX Lion. Now, I started following Harvard CS50 course on cs50.net. I'm not totally new to programming but I was curious on how this course has been taught. This is the source of name.c: #include <stdio.h> #include <cs50.h> int main(void) { printf("State your name:\n"); string name = GetString(); printf("O hai, %s!\n", name); return 0; } As you can see, it requires this library: https://manual.cs50.net/CS50_Library . Now, when I compile it, this happens: Undefined symbols for architecture x86_64: "_GetString",