c14

C14/Makefile

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+include ../Makefile

C14/ex1.c

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+#include <stdio.h>
+#include <math.h>
+
+void cartesian_to_polar(float x, float y, float *r, float *theta) {
+	*r = sqrtf(x*x + y*y);
+	*theta = y/x;
+}
+
+int main() {
+	int rc;
+	float x, y, r, theta;
+
+	printf("x: ");
+	rc = scanf("%f", &x);
+	// check that scanf was successful by checking if it returned 1 (1 successfully scanned item)
+	if (rc != 1) {
+		printf("Please enter a real number\n");
+		return 1;
+	}
+
+	printf("y: ");
+	rc = scanf("%f", &y);
+	if (rc != 1) {
+		printf("Please enter a real number\n");
+		return 1;
+	}
+
+	cartesian_to_polar(x, y, &r, &theta);
+	printf("r=%f theta=%f\n", r, theta);
+
+	return 0;
+}

C14/ex2.c

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+#include <stdio.h>
+#include <math.h>
+
+
+float degrees_to_radians(float degrees) {
+	return M_PI * degrees / 180.0;
+}
+
+void process(float degrees, float* radians, float* sin_val, float* cos_val, float* tan_val) {
+	*radians = degrees_to_radians(degrees);
+	*sin_val = sin(*radians);
+	*cos_val = cos(*radians);
+	*tan_val = tan(*radians);
+}
+
+
+int main() {
+	float degrees, radians, sin_val, cos_val, tan_val;
+
+	printf("Degrees: ");
+	scanf("%f", &degrees);
+
+	process(degrees, &radians, &sin_val, &cos_val, &tan_val);
+
+	printf("Radians: %f\n", radians);
+	printf("Sine: %f\n", sin_val);
+	printf("Cosine: %f\n", cos_val);
+	printf("Tangent: %f\n", tan_val);
+}

C14/ex3.c

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+#include <stdio.h>
+#include <math.h>
+
+
+float degrees_to_radians(float degrees) {
+	return M_PI * degrees / 180.0;
+}
+
+void process(float degrees, float* radians, float* sin_val, float* cos_val, float* tan_val) {
+	*radians = degrees_to_radians(degrees);
+	*sin_val = sin(*radians);
+	*cos_val = cos(*radians);
+	*tan_val = tan(*radians);
+}
+
+
+int main() {
+	int degrees_start, degrees_end;
+	float radians, sin_val, cos_val, tan_val;
+
+	printf("Start: ");
+	scanf("%d", &degrees_start);
+	printf("End: ");
+	scanf("%d", &degrees_end);
+	printf("Degs\tRad\tsin\tcos\ttan\n");
+
+	for (int i = degrees_start; i <= degrees_end; i++) {
+		process((float)i, &radians, &sin_val, &cos_val, &tan_val);
+		printf("%d\t%0.3f\t%0.3f\t%0.3f\t%0.3f\n", i, radians, sin_val, cos_val, tan_val);
+	}
+
+
+}

Makefile

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+CFLAGS=-lm
+
+%.c:
+	$(CC) $(CFLAGS) -c $< -o $*