From b768ac1a141f853889660dfabdce0ad6e47be034 Mon Sep 17 00:00:00 2001
From: hugogogo <hugogogo@protonmail.com>
Date: Thu, 7 May 2026 00:58:54 +0200
Subject: [PATCH] adding modf pow and round

---
 Makefile                       |  5 ++++-
 includes/libft.h               |  5 ++++-
 srcs/{ft_abs_f.c => ft_fabs.c} |  2 +-
 srcs/ft_modf.c                 | 23 +++++++++++++++++++++++
 srcs/ft_pow.c                  | 19 +++++++++++++++++++
 srcs/ft_round.c                | 28 ++++++++++++++++++++++++++++
 6 files changed, 79 insertions(+), 3 deletions(-)
 rename srcs/{ft_abs_f.c => ft_fabs.c} (69%)
 create mode 100644 srcs/ft_modf.c
 create mode 100644 srcs/ft_pow.c
 create mode 100644 srcs/ft_round.c

diff --git a/Makefile b/Makefile
index 3863b5b..ff109da 100644
--- a/Makefile
+++ b/Makefile
@@ -120,12 +120,15 @@ SRCS	=	ft_memset.c \
 			pf_utils.c \
 			\
 			ft_abs.c \
-			ft_abs_f.c \
+			ft_fabs.c \
 			ft_greater.c \
 			ft_smaller.c \
 			ft_sign.c \
 			ft_sign_f.c \
+			ft_modf.c \
+			ft_pow.c \
 			ft_sqrt.c \
+			ft_round.c \
 			ft_free_tab.c \
 			\
 			ft_arrint.c
diff --git a/includes/libft.h b/includes/libft.h
index 83b736d..7f1ffc7 100644
--- a/includes/libft.h
+++ b/includes/libft.h
@@ -122,11 +122,14 @@ void ft_putnbrendl(int n);
 void ft_putnbrendl_fd(int n, int fd);
 char *ft_concat_free(char *str1, char *str2);
 int ft_abs(int n);
-double ft_abs_f(double n);
+double ft_fabs(double n);
 int ft_greater(int a, int b);
 int ft_smaller(int a, int b);
 int ft_sign(int i);
 int ft_sign_f(double i);
+double ft_modf(double x, double *int_part);
+double ft_pow(double base, int exponent);
+double ft_round(double x);
 int ft_sqrt(int i);
 void ft_free_tab(char **tab);
 
diff --git a/srcs/ft_abs_f.c b/srcs/ft_fabs.c
similarity index 69%
rename from srcs/ft_abs_f.c
rename to srcs/ft_fabs.c
index 4d0121a..45c9223 100644
--- a/srcs/ft_abs_f.c
+++ b/srcs/ft_fabs.c
@@ -1,6 +1,6 @@
 #include "libft.h"
 
-double ft_abs_f(double n)
+double ft_fabs(double n)
 {
 	if (n < 0)
 		n *= -1;
diff --git a/srcs/ft_modf.c b/srcs/ft_modf.c
new file mode 100644
index 0000000..285a15e
--- /dev/null
+++ b/srcs/ft_modf.c
@@ -0,0 +1,23 @@
+#include "libft.h"
+
+/**
+ * Splits a double into its integer and fractional parts,
+ * it returns the fractional part,
+ * and stores the integer part in the in_part param (if not null)
+ * e.g.:
+ *  -3.7 → -3.0 and -0.7 (returns -0.7)
+ */
+double ft_modf(double x, double *int_part)
+{
+	// extract the integer part by casting to long long
+	long long integer = (long long)x;
+	if (int_part != NULL)
+	{
+		*int_part = (double)integer;
+	}
+
+	// compute the fractional part
+	double frac_part = x - *int_part;
+
+	return frac_part;
+}
diff --git a/srcs/ft_pow.c b/srcs/ft_pow.c
new file mode 100644
index 0000000..781a887
--- /dev/null
+++ b/srcs/ft_pow.c
@@ -0,0 +1,19 @@
+#include "libft.h"
+
+/**
+ * returns the value of 'base' raised to the power of 'exponent'
+ */
+double ft_pow(double base, int exponent)
+{
+	int i;
+	double result;
+
+	result = 1.0;
+	i = 0;
+	while (i < exponent)
+	{
+		result *= base;
+		i++;
+	}
+	return result;
+}
diff --git a/srcs/ft_round.c b/srcs/ft_round.c
new file mode 100644
index 0000000..7c70467
--- /dev/null
+++ b/srcs/ft_round.c
@@ -0,0 +1,28 @@
+#include "libft.h"
+
+/**
+ * round  x to the nearest integer,
+ * but round halfway cases away from zero, regardless of the current rounding direction
+ */
+double ft_round(double x)
+{
+    // Handle special cases
+    if (x != x)
+    {             // Check for NaN (NaN is not equal to itself)
+        return x; // Return NaN
+    }
+    if (x == (double)LLONG_MAX + 1.0 || x == (double)LLONG_MIN - 1.0)
+    {
+        return x; // Return ±Infinity or the original value if overflow would occur
+    }
+
+    // Handle positive and negative numbers
+    if (x >= 0)
+    {
+        return (double)(long long)(x + 0.5);
+    }
+    else
+    {
+        return (double)(long long)(x - 0.5);
+    }
+}
\ No newline at end of file