did the assignment

assignment2.txt

@@ -0,0 +1,15 @@
+Harry Brickner
+
+1) Sure! For example, "int six = 1 + 2 + 3;"
+
+2) As far as the computer is concerned, the only errors that exist are syntax errors. A program will run with logical errors, but not work the way it's intended to, whereas a program will not run if it has syntax errors.
+
+3) True
+
+4) It is not valid. "0 < x" is a boolean, so the "< 15" tries to compare itself to a boolean value.
+
+5) 1) invalid: an if() is followed by a {, not a "then"
+   2) invalid: the boolean needs to be surrounded by parentheses
+   3) valid
+   4) valid
+

calculator.c

@@ -0,0 +1,131 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+char ascii[21][31] = {
+	"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+	"b                             b",	
+	"b                             b",	
+	"b                             b",
+	"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+	"b     b     b     b     b     b",
+	"b  1  b  2  b  3  b  +  b  =  b",
+	"b     b     b     b     b     b",
+	"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+	"b     b     b     b     b     b",
+	"b  4  b  5  b  6  b  -  b del b",
+	"b     b     b     b     b     b",
+	"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+	"b     b     b     b     b     b",
+	"b  7  b  8  b  9  b  *  b clr b",
+	"b     b     b     b     b     b",
+	"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+	"b     b     b     b     b     b",
+	"b  0  b  .  b  %  b  /  b exitb",
+	"b     b     b     b     b     b",
+	"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
+};
+char value[30] = "                             ";
+char buttons[4][5] = {
+	{'1', '2', '3', '+', '='},
+	{'4', '5', '6', '-', 'd'},
+	{'7', '8', '9', '*', 'c'},
+	{'0', '.', '%', '/', 'x'}
+};
+int selectedX = 0;
+int selectedY = 0;
+
+void replaceBackground(char from, char to){
+	int selectedXLoc = selectedX * 6 + 1;
+	int selectedYLoc = selectedY * 4 + 5;
+	for(int x = 0; x < 5; x++){
+		for(int y = 0; y < 4; y++){
+			if(ascii[selectedYLoc + y][selectedXLoc + x] == from)
+				ascii[selectedYLoc + y][selectedXLoc + x] = to;
+		}
+	}
+}
+void scrollUp(int lines){
+	for(int i = 0; i < lines; i++) printf("\033[F");
+}
+void update(){
+	scrollUp(22);
+	ascii[2][0] = 'b';
+	ascii[2][30] = 'b';
+	for(int i = 0; i < 29; i++) ascii[2][i + 1] = value[i];
+	for(int i = 0; i < 21; i++){
+		for(int j = 0; j < 31; j++){
+			switch(ascii[i][j]){
+				case 's': printf("%s", "░"); break;
+				case 'b': printf("%s", "█"); break;
+				default: printf("%c", ascii[i][j]);
+			}
+		}
+		printf("\n");
+	}
+}
+
+void changeSelected(int deltaX, int deltaY){
+	replaceBackground('s', ' ');
+	/* have to do this because modulo operators give negative results in certain cases */
+	selectedX = (((selectedX + deltaX) % 5) + 5) % 5;
+	selectedY = (((selectedY + deltaY) % 4) + 4) % 4;
+	replaceBackground(' ', 's');
+}
+double mod(double a, double b){
+	while(a >= 0){
+		 a -=b;
+	}
+	a += b;
+	return b;
+}
+int printIndex = 0;
+void executeButton(){
+
+
+	double num1, num2;
+	char operation;
+	double output;
+	switch(buttons[selectedY][selectedX]){
+		case 'd': if(printIndex == 0) break; value[--printIndex] = ' '; break;
+		case 's': for(int i = 0; i < 30; i++)value[i] = ' '; printIndex = 0; break;
+		case '=': 
+
+			if(sscanf(value, "%lf%c%lf", &num1, &operation, &num2) < 3){
+				printf("Error\n");
+				exit(0);
+			}
+
+			switch(operation){
+				case '+': output = num1 + num2; break;
+				case '-': output = num1 - num2; break;
+				case '*': output = num1 * num2; break;
+				case '/': output = num1 / num2; break;
+				case '%': output = mod(num1, num2); break;
+			}
+			printf("%f\n", output);
+		case 'x': exit(0);
+		default: value[printIndex++] = buttons[selectedY][selectedX];
+	}
+	update();
+	printf("%d", printIndex);
+}
+
+
+int main(){
+	for(int i = 0; i < 22; i++)printf("\n");
+	replaceBackground(' ', 's');
+	update();
+	while(1){
+		char input = getchar();
+		switch(input){
+			case 'q': return 0;
+			case 'w': changeSelected(0, -1); update(); break;
+			case 'a': changeSelected(-1, 0); update(); break;
+			case 's': changeSelected(0, 1); update(); break;
+			case 'd': changeSelected(1, 0); update(); break;
+			case 'e': executeButton(); break;
+
+		}
+	}
+	return 0;
+}

calculatorOld.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+double mod(double a, double b){
+	while(a >= 0){
+		 a -=b;
+	}
+	a += b;
+	return b;
+}
+int main(){
+	double num1;
+	double num2;
+	printf("Hello, what's your first number?\n");
+	scanf("%lf", &num1);
+	printf("And what's your second number?\n");
+	scanf("%lf",  &num2);
+	printf("Which of the following operations should I do? + - * / %%\n");
+	char operation;
+	scanf("\n%c", &operation);
+
+	double output;
+	switch(operation){
+		case '+': output = num1 + num2; break;
+		case '-': output = num1 - num2; break;
+		case '*': output = num1 * num2; break;
+		case '/': output = num1 / num2; break;
+		case '%': output = mod(num1, num2); break;
+	}
+	printf("Answer is %lf\n", output);
+	return 0;
+}

randnum.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+int main(){
+	srand(time(0));
+	int r = (rand() % 10) + 1;
+	printf("guess a number!\n");
+	while(1){
+		int guess;
+		scanf("%d",&guess);
+		if(guess > r){
+			printf("Too high!\n");
+		}else if(guess < r){
+			printf("Too low!\n");
+		}else{
+			printf("Correct!\n");
+			return 0;
+		}
+	}
+}

sign.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+/* Harry Brickner
+   Tells someone if a number is positive or negative. */
+int main(){
+	float input;
+	printf("Hello! Gimme a number please!\n");
+	scanf("%f", &input);
+	/* I cant figure out string concatenation so... here's this instead */
+	printf("It's ");
+	printf(input > 0? "Positive" : input < 0? "Negative" : "Zero");
+	printf("\n");
+	return 0;
+}