diff options
-rw-r--r-- | .gitignore | 1 | ||||
-rw-r--r-- | cbook/one_one.c | 34 | ||||
-rw-r--r-- | cbook/one_two.c | 36 |
3 files changed, 71 insertions, 0 deletions
@@ -1,2 +1,3 @@ clip/clip parsing/parsing +a.out diff --git a/cbook/one_one.c b/cbook/one_one.c new file mode 100644 index 0000000..9896026 --- /dev/null +++ b/cbook/one_one.c @@ -0,0 +1,34 @@ +#include <stdio.h> + +/* +* Tell the compiler that we intend +* to use a function called show_message. +* It has no arguments and returns no value +* This is the "declaration". +* +*/ + +void show_message(void); +/* +* Another function, but this includes the body of +* the function. This is a "definition". +*/ +int main(){ + int count; + + count = 0; + while(count < 10){ + show_message(); + count = count + 1; + } + + return(0); +} + +/* +* The body of the simple function. +* This is now a "definition". +*/ +void show_message(void){ + printf("hello\n"); +} diff --git a/cbook/one_two.c b/cbook/one_two.c new file mode 100644 index 0000000..a5bf221 --- /dev/null +++ b/cbook/one_two.c @@ -0,0 +1,36 @@ +/* +* +* Dumb program that generates prime numbers. +*/ +#include <stdio.h> +#include <stdlib.h> + + +int is_prime(int x) { + for (int i=2; i<x; i++) { + if (x % i == 0 && i != x) return 0; + } + return 1; +} + + + + +int main(){ + int this_number, prime, next_prime, next_number; + + this_number = 3; + + while(this_number < 10000){ + prime = is_prime(this_number); + if (prime == 1) { + next_number = this_number + 2; + next_prime = is_prime(next_number); + if (next_prime == 1) + printf("%d and %d are prime pair\n", this_number, next_number); + } + this_number++; + + } + exit(EXIT_SUCCESS); +} |