From: Jérôme Benoit Date: Wed, 1 Mar 2017 21:27:58 +0000 (+0100) Subject: Add dichotomic search algorithm in sorted tab C implementation. X-Git-Url: https://git.piment-noir.org/?a=commitdiff_plain;h=0d5ad0cfe0d0b38fc4bcde100d697ff0683490f9;p=Algorithmic_C.git Add dichotomic search algorithm in sorted tab C implementation. Signed-off-by: Jérôme Benoit --- diff --git a/TP1/exo3/Makefile b/TP1/exo3/Makefile new file mode 100644 index 0000000..d6f215e --- /dev/null +++ b/TP1/exo3/Makefile @@ -0,0 +1,79 @@ +# Sample Makefile to build simple project. +# +# This Makefile expect all source files (.c) to be at the same level, in the +# current working directory. +# +# It will automatically generate dependencies, compile all files, and produce a +# binary using the provided name. +# +# Set BINARY_NAME to the name of the binary file to build. +# Set BUILD_TYPE to either debug or release +# +# Automatic dependencies code from: +# http://make.mad-scientist.net/papers/advanced-auto-dependency-generation/#tldr +BINARY_NAME=exo3 +BUILD_TYPE=debug + +# ==================================== +# DO NOT CHANGE STUFF BEYOND THIS LINE +# ==================================== + +all: $(BINARY_NAME) + +CC=gcc +LD=gcc + +WARN_FLAGS = -Wall -Wextra +STD_FLAG = -std=c99 + +ifeq ($(BUILD_TYPE),debug) +BUILDDIR := .build/debug +DEBUG_FLAG = -g +STRIP_FLAG = +OPTI_FLAG = -O0 +else +BUILDDIR := .build/release +DEBUG_FLAG = +STRIP_FLAG = -s +OPTIFLAG = -O3 +endif + +CFLAGS := $(CFLAGS) $(WARN_FLAGS) $(STD_FLAG) $(OPTI_FLAG) $(DEBUG_FLAG) +LDFLAGS := $(LDFLAGS) $(STRIP_FLAG) + +OBJDIR := $(BUILDDIR)/objs +$(shell mkdir -p $(OBJDIR)) + +SRCS=$(wildcard *.c) +OBJS=$(patsubst %.c,$(OBJDIR)/%.o,$(SRCS)) + +DEPDIR := $(BUILDDIR)/deps +$(shell mkdir -p $(DEPDIR)) +DEPFLAGS = -MT $@ -MMD -MP -MF $(DEPDIR)/$*.Td +POSTCOMPILE = mv -f $(DEPDIR)/$*.Td $(DEPDIR)/$*.d + +$(BINARY_NAME): $(OBJS) + @echo "[LD ] $@" + @$(LD) $(CFLAGS) $(LDFLAGS) $^ $(LDLIBS) -o $@ + +$(OBJDIR)/%.o: %.c $(DEPDIR)/%.d + @echo "[C ] $*" + @$(CC) $(DEPFLAGS) $(CFLAGS) -c $< -o $@ + @$(POSTCOMPILE) + +$(DEPDIR)/%.d: ; + +.PRECIOUS: $(DEPDIR)/%.d + +include $(wildcard $(patsubst %,$(DEPDIR)/%.d,$(basename $(SRCS)))) + +clean: + @echo "[CLN]" + -@rm -r $(BUILDDIR) + -@rm $(BINARY_NAME) + +disassemble: $(BINARY_NAME) + objdump -d $< | less + +symbols: $(BINARY_NAME) + objdump -t $< | sort | less diff --git a/TP1/exo3/exo3.c b/TP1/exo3/exo3.c new file mode 100644 index 0000000..f668493 --- /dev/null +++ b/TP1/exo3/exo3.c @@ -0,0 +1,27 @@ +#include + +int rechercheDicho(int e, int T[], int d, int f) { + int m; + if (f < d) {return -1;} + m = (f+d)/2; + if (T[m] == e) {return m;} + if (e < T[m]) { + return rechercheDicho(e, T, d, m-1); + } else { + return rechercheDicho(e, T, m+1, f); + } +} + +int main() { + int T[9] = {1, 2, 3, 6, 6, 7, 9, 11, 12}; + + int result = rechercheDicho(8, T, 0, 9); + + if (result > 0) { + printf("element present a index=%d\n", result); + } else { + printf("element non present\n"); + } + + return 0; +}