Question

What's the meaning of sum +=num[] in c++ arrays?(especially for an array like num[])?

Answer 1

sum += num[] means sum = sum + num[]

or simply, sum[0] = sum[0] + num[0]

Answer 2

Hey,

sum+=num[] means sum=sum+num[];

Answer 3

#include<stdio.h>

main()

{

int I,n,sum=0,num[20];

printf("enter no.of numgers\n");

scanf("%d",&n);

for(I=0;i<n;i++)

{

sum=sum+num[I];

}

printf("sum=%d\t",sum);

}

Answer 4

sum += num[ ]means sum = sum + num[ ]

Answer 5

its called as array index.

syntax:

data type  var name[size]

int a[3]

its used to allocate the memory for the variables.

          0                                           1                                                  2

         100                                        102                                    104

these(0,1,2)is your memory and (100,102,104)is your memory address.

note:

Array index starts with the value 0 and ends with the value n-1 which n is the size. 

Answer 6

i+=1;

Means i=i+1; there fore sum=sum+num[i]; means

Suppose value of num[i]=1 and sum=5;

Therefore sum=sum+num[i];

                   Sum= 5 + 1;

And now 6 is stored in sum :::: answer-- sum=6

num[i] is 1 dimensional array.