给定一个整数数组，求其元素之和。 例如：
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Input : arr[] = {1, 2, 3}Output : 61 + 2 + 3 = 6Input : arr[] = {15, 12, 13, 10}Output : 50
C++
/* C++ Program to find sum of elements in a given array */ #include <bits/stdc++.h> using namespace std; // function to return sum of elements // in an array of size n int sum( int arr[], int n) { int sum = 0; // initialize sum // Iterate through all elements // and add them to sum for ( int i = 0; i < n; i++) sum += arr[i]; return sum; } // Driver code int main() { int arr[] = {12, 3, 4, 15}; int n = sizeof (arr) / sizeof (arr[0]); cout << "Sum of given array is " << sum(arr, n); return 0; } // This code is contributed by rathbhupendra |
C
/* C Program to find sum of elements in a given array */ #include <bits/stdc++.h> // function to return sum of elements // in an array of size n int sum( int arr[], int n) { int sum = 0; // initialize sum // Iterate through all elements // and add them to sum for ( int i = 0; i < n; i++) sum += arr[i]; return sum; } int main() { int arr[] = {12, 3, 4, 15}; int n = sizeof (arr) / sizeof (arr[0]); printf ( "Sum of given array is %d" , sum(arr, n)); return 0; } |
JAVA
/* Java Program to find sum of elements in a given array */ class Test { static int arr[] = { 12 , 3 , 4 , 15 }; // method for sum of elements in an array static int sum() { int sum = 0 ; // initialize sum int i; // Iterate through all elements and add them to sum for (i = 0 ; i < arr.length; i++) sum += arr[i]; return sum; } // Driver method public static void main(String[] args) { System.out.println( "Sum of given array is " + sum()); } } |
Python3
# Python 3 code to find sum # of elements in given array def _sum(arr,n): # return sum using sum # inbuilt sum() function return ( sum (arr)) # driver function arr = [] # input values to list arr = [ 12 , 3 , 4 , 15 ] # calculating length of array n = len (arr) ans = _sum(arr,n) # display sum print ( 'Sum of the array is ' ,ans) # This code is contributed by Himanshu Ranjan |
C#
// C# Program to find sum of elements in a // given array using System; class GFG { // method for sum of elements in an array static int sum( int []arr, int n) { int sum = 0; // initialize sum // Iterate through all elements and // add them to sum for ( int i = 0; i < n; i++) sum += arr[i]; return sum; } // Driver method public static void Main() { int []arr = {12,3,4,15}; int n = arr.Length; Console.Write( "Sum of given array is " + sum(arr, n)); } } // This code is contributed by Sam007. |
PHP
<?php // PHP Program to find sum of // elements in a given array // function to return sum // of elements in an array // of size n function sum( $arr , $n ) { // initialize sum $sum = 0; // Iterate through all elements // and add them to sum for ( $i = 0; $i < $n ; $i ++) $sum += $arr [ $i ]; return $sum ; } // Driver Code $arr = array (12, 3, 4, 15); $n = sizeof( $arr ); echo "Sum of given array is " , sum( $arr , $n ); // This code is contributed by aj_36 ?> |
Javascript
<script> //JavaScript Program to find //sum of elements in a given array // function to return sum of elements // in an array of size n function sum(arr) { let sum = 0; // initialize sum // Iterate through all elements // and add them to sum for (let i = 0; i < arr.length; i++) sum += arr[i]; return sum; } // Driver code let arr = [12, 3, 4, 15]; document.write( "Sum of given array is " + sum(arr)); // This code is contributed by Surbhi Tyagi </script> |
输出：
Sum of given array is 34
时间复杂性： O（n）
辅助空间： O（1）
另一种方法： 使用STL 调用STL中数组元素和的内置函数。 累积（第一、最后、总和）； first，last：范围的第一个和最后一个元素 要添加哪些元素 总和：总和的初始值
此函数返回数组和。
C++
/* C++ Program to find sum of elements in a given array */ #include <bits/stdc++.h> using namespace std; // Driver code int main() { int arr[] = {12, 3, 4, 15}; int n = sizeof (arr) / sizeof (arr[0]); // calling accumulate function, passing first, last element and // initial sum, which is 0 in this case. cout << "Sum of given array is " << accumulate(arr, arr + n, 0); return 0; } // This code is contributed by pranoy_coder |
JAVA
/* Java Program to find sum of elements in a given array */ import java.util.*; class GFG{ static int accumulate( int []arr) { int sum = 0 ; for ( int i = 0 ; i < arr.length; i++) { sum = sum + arr[i]; } return sum; } // Driver code public static void main(String[] args) { int arr[] = { 12 , 3 , 4 , 15 }; int n = arr.length; // calling accumulate function, passing first, last element and // initial sum, which is 0 in this case. System.out.print( "Sum of given array is " + accumulate(arr)); } } // This code is contributed by umadevi9616 |
Python3
# Python3 program to find sum of elements # in a given array # Driver code if __name__ = = "__main__" : arr = [ 12 , 3 , 4 , 15 ] n = len (arr) # Calling accumulate function, passing # first, last element and initial sum, # which is 0 in this case. print ( "Sum of given array is " , sum (arr)); # This code is contributed by ukasp |
C#
/* C# Program to find sum of elements in a given array */ using System; public class GFG { static int accumulate( int [] arr) { int sum = 0; for ( int i = 0; i < arr.Length; i++) { sum = sum + arr[i]; } return sum; } // Driver code public static void Main(String[] args) { int []arr = { 12, 3, 4, 15 }; int n = arr.Length; // calling accumulate function, passing first, last element and // initial sum, which is 0 in this case. Console.Write( "Sum of given array is " + accumulate(arr)); } } // This code is contributed by gauravrajput1 |
Javascript
<script> /* javascript Program to find sum of elements in a given array */ function accumulate(arr) { let sum = 0; for (let i = 0; i < arr.length; i++) { sum = sum + arr[i]; } return sum; } // Driver code let arr = [12, 3, 4, 15]; let n = arr.length; // calling accumulate function, passing first, last element and // initial sum, which is 0 in this case document.write( "Sum of given array is " + accumulate(arr)); // This code is contributed by vaibhavrabadiya3. </script> |
输出
Sum of given array is 34
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