The Quora example at...

The Quora example at https://www.quora.com/What-is-the-difference-between-decision-coverage-and-condition-coverage-when-it-comes-to-code-coverage

Makefile

-all:
-	gcc -g -O0 -fprofile-arcs -ftest-coverage coverage_demo.c
+coverage_demo:
+	gcc -g -O0 -fprofile-arcs -ftest-coverage -o $@ coverage_demo.c
 
-report:
+report:	coverage_demo
+	$(MAKE)
 	gcov -pcb coverage_demo.c
 	cat coverage_demo.c.gcov
 
+decision: coverage_demo
+	$(MAKE) clean
+	$(MAKE)
+	./coverage_demo 3 0 2
+	./coverage_demo 1 0 1
+	$(MAKE) report
+
+condition: coverage_demo
+	$(MAKE) clean
+	$(MAKE)
+	./coverage_demo 1 0 2
+	./coverage_demo 2 1 1
+	$(MAKE) report
+
+mcdc:	coverage_demo
+	$(MAKE) clean
+	$(MAKE)
+	./coverage_demo 2 0 1
+	./coverage_demo 3 1 2
+	./coverage_demo 1 0 1
+	$(MAKE) report
+
 clean:
-	rm -f coverage_demo.c.gcov coverage_demo.gcda coverage_demo.gcno a.out
+	rm -f coverage_demo.c.gcov coverage_demo.gcda coverage_demo.gcno coverage_demo

coverage_demo.c

@@ -4,11 +4,18 @@
 
 int main(int argc, char *argv[])
 {
-    uint32_t t1 = atoi(argv[1]);
-    uint32_t t2 = t1 < 8 && t1 > 2;
-    if (t1 < 7 && t1 > 3)
-        printf("3<%d<7 was true\n", t1);
-    else
-        printf("3<%d<7 was false\n", t1);
+    uint32_t a = atoi(argv[1]);
+    uint32_t b = atoi(argv[2]);
+    uint32_t x = atoi(argv[3]);
+    if (a > 1 && b == 0) { 
+        puts("Decision 1 was true");
+    } else {
+        puts("Decision 1 was false");
+    } 
+    if (a == 2 || x > 1) { 
+        puts("Decision 2 was true");
+    } else {
+        puts("Decision 2 was false");
+    } 
     return 0;
 }