Progress

first-c.C

@@ -0,0 +1,43 @@
+// Every C program is an operating system process/executable
+// C uses the same kind of comments as JavaScript
+
+// #includes allow us to combine different files into a single program
+// #including can be pointed at a file that you wrote, or it can be 
+// pointed at a file someone else wrote. You have to know where the
+// file is, and whether or not it is the one you need!
+#include <stdio.h>
+/*Lines 10 - 18 are an example of various C primitives
+int integerFunction(int input) {
+  return 0;
+}
+float floatFunction(float input) {
+  return 0.0;
+}
+float mixedFunction(float input) {
+  return 0.0; 
+}
+*/
+
+int main(int argc, char** argv) {
+/* char** means one of two things:
+  (1) someone is doing something complicated
+  aka an algorithm with this object (it is a pointer to a pointer)
+  (2) or it means it is a two-dimensional array >> argv[][]
+
+  argv = [['g', 'c', 'c'], ['a', 'b', 'c'], ['g', 'c', 'c'],['h', 'i']];
+
+NOTE: In C, a string is an array of characters.
+(1) a string is in double quotes
+(2) a character (char) is in single quotes
+*/
+
+// vvv the simplest possible C program 
+  return 100;
+
+  // printf("argc is: ");
+  // printf("%d\n", argc);
+
+  // for(int i = 0; i < argc; ++i) {
+  //   printf("%s\n", argv[i]);
+  // }
+}

first_C_programming_assignment.C

@@ -1,8 +1,8 @@
 /**
- * primitives (int char float double)
- * loops, break, continue
- * branches if else else if, while
- * arrays
+* primitives (int char float double)
+* loops, break, continue
+* branches if else else if, while
+* arrays
  * structs (to become classes)
  * ^^^ ^^^ ^^^ ^^^ ^^^
  * Operating Systems C Lesson Assignment 1
@@ -37,12 +37,111 @@
 // In order to run a program, you must:
 // Write this C file
 // Make it syntactically correct
-// Compile the program with gcc my_first_C_program.C -o my_output
+// Compile the program with gcc first_C_programming_assignment.C -o my_output
 // ./my_output
 
+// READ ABOUT: vvv Popular Header Files
 #include <stdio.h>
 
-int main(int argc, char** argv) {
-  printf("Hello world!");
+// (1) * primitives (int char float double)
+int integerAddFunction() 
+{ 
+  int a = 3;
+  float b = 4.5;
+  double c = 5.25;
+  float sum;
+
+  sum = a + b + c;
+// printf stands for 'print formatted'
+  printf("The sum of a, b, and c is float %f. \n", sum);
+  printf("\n");
+  return 0;
+}
+// (2) * loops, break, continue
+
+int forLoopFunction()
+{
+  printf("Start of forLoop Function: \n");
+  int A[] = {2, 4, 6, 8};
+  int i;
+
+  for (i = 0; i < 4; i++)
+  {
+    printf("Address = %d\n", &A[i]);
+    printf("Address = %d\n", A + i);
+    printf("Pointer Value = %d\n", A[i]);
+    printf("Pointer Value = %d\n", *(A + i));
+    printf("\n");
+  }
+    printf("Total Array Size in Bytes = %d\n", sizeof(A));
+    printf("\n");
+  return 0;
+}
+
+int whileLoopFunction()
+{
+  printf("Start of WhileLoop Function: \n");
+  char A[7] = "Steven";
+  int i = 0;
+
+  while(A[i] != '\0')
+  {
+    printf("%c", A[i]);
+    printf("\n");
+    i++;
+  }
+  printf("\n");
+  return 0;
+}
+
+// (3) * branches if else else if, while
+
+// (4) * arrays
+int printArray() 
+{
+  printf("Start of PrintArray Function: \n");
+
+  int A[] = {2, 4, 6, 8};
+  printf("Memory Address = %d\n", A);
+  printf("Memory Address = %d\n", &A[0]);
+  printf("Pointer Value = %d\n", A[0]);
+  printf("Pointer Value = %d\n", *A);
+  printf("\n");
+
+/* defines an array of 6 integers */
+  int numbers[6];
+/* populates the array */
+  numbers[0] = 0;
+  numbers[1] = 1;
+  numbers[2] = 2;
+  numbers[3] = 3;
+  numbers[4] = 4;
+  numbers[5] = 5;
+/* print the 3rd number from the array */
+  return printf("The 3rd number in the array is: %d. \n", numbers[3]);
+
+  char name[] = "Stevie Magic";
+
+
 }
 
+// (5) * structs (to become classes)
+
+
+// the main() f(x) invokes other functions within it
+// it is the first f(x) to be called when program starts execution
+// the diff btwn int main() VS. void main() is the return type 
+// (i.e., VOID will not return a value to the OS
+int main(int argc, char** argv) {
+// READ ABOUT: Program Status Variable Integer
+  integerAddFunction();
+
+  forLoopFunction();
+
+  whileLoopFunction();
+
+  printArray();
+
+  printf("Hello world!\n");
+  return 0; 
+}