4.3

Uebung 4/Uebung4_3/Makefile

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+
+# Name of the binary for Development
+BINARY = main
+# Name of the binary for Release
+FINAL = prototyp
+# Object files
+OBJS   = digitSum.o
+# Compiler flags
+CFLAGS = -Werror -Wall -std=c++17 -fsanitize=address,undefined -g
+# Linker flags
+LFLAGS = -fsanitize=address,undefined
+#Which Compiler to use
+COMPILER = c++
+
+
+# all target: builds all important targets
+all: binary
+
+final : ${OBJS}
+	${COMPILER} ${LFLAGS} -o ${FINAL} ${OBJS}
+	rm ${OBJS}
+
+binary : ${OBJS}
+	${COMPILER} ${LFLAGS} -o ${BINARY} ${OBJS}
+
+# Links the binary
+${BINARY} : ${OBJS}
+	${COMPILER} ${LFLAGS} -o ${BINARY} ${OBJS}
+
+
+# Compiles a source-file (any file with file extension .c) into an object-file
+#
+# "%" is a wildcard which matches every file-name (similar to * in regular expressions)
+# Such a rule is called a pattern rule (because it matches a pattern, see https://www.gnu.org/software/make/manual/html_node/Pattern-Rules.html),
+# which are a form of so called implicit rules (see https://www.gnu.org/software/make/manual/html_node/Implicit-Rules.html)
+# "$@" and "$<" are so called automatic variables (see https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html)
+%.o : %.cpp
+	${COMPILER} -c ${CFLAGS} -o $@ $<
+
+
+# Rules can not only be used for compiling a program but also for executing a program
+run: ${BINARY}
+	./${BINARY}
+
+
+# Delete all build artifacts
+clean :
+	rm -rf ${BINARY} ${OBJS}
+
+
+# all  and clean are a "phony" targets, meaning they are no files
+.PHONY : all clean

Uebung 4/Uebung4_3/digitSum.cpp

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+#include <iostream>
+#include <string>
+
+/*  algorithm that "hashes" the through digit sum. The size needed for
+ * this would be 64, since telephone numbers are exactly 7 digits long and the
+ * maximum value a digit can have is 9 -> 7*9 = 63, plus 1 since we start at
+ * zero. */
+int digitSum(std::string telNr) {
+  uint32_t number = std::stoi(telNr);
+  uint8_t digitSum = 0;
+  while (number > 0) {
+    digitSum += number % 10;
+    number /= 10;
+  }
+  return digitSum;
+}
+
+int main() { std::cout << digitSum("9797979") << std::endl; }