sir i am a new programmer.So i am facing some new problems which I really need to solve. Like I write a code
#include<stdio.h>
main(){
int ara[] ={10,20,30,40,50,60,70,80,90,100},i,temp,j;
for(i=0,j=9;i<10;i++,j--){
ara[i]=ara[j];
printf("%d\n",ara[i]); }
}
I thought the result would be 100,90,80,70,60,50,40,30,20,10 but the result is not like this...Would anyone please tell me why the result shows 100,90,80,70,60,60,70,80,90,100
After printing value 60, i.e. half of the array when you try to access elements further, actually you will access those elements which are of the locations after mid of the array. because you are assigning them using ara[i] = ara[j]..so you will end up with repetition after half of array. As:-
ara[0] = ara[9]
ara[1] = ara[8]
ara[2] = ara[7]
ara[3] = ara[6]
ara[4] = ara[5]
ara[5] = ara[4]
The simplest solution may be creating a temporary array:-
#include<stdio.h>
main(){
int ara[] ={10,20,30,40,50,60,70,80,90,100},i,temp[10],j;
for(i = 9, j = 0; i >= 0; i--, j++){
temp[j]=ara[i];
}
for(i = 0; i < 10; i++){
printf("%d\n", temp[i]);
}
}
What you are doing in this code?
reversing an array
Why are you printing 100,90,80,70,60,50,60,70,...
because when you reach the 6th one (ara[4]), you've already swapped it with 4th one (ara[6])
You need to save in the temporary variable the value which is written first
Some examples
char *reverse(char *str)
{
char tmp;
int len;
if (str != NULL)
{
len = strlen(str);
for (int i = 0; i < len / 2; i++)
{
tmp = *(str + i);
*(str + i) = *(str + len - i - 1);
*(str + len - i - 1) = tmp;
}
}
return str;
}
int *reverseints(int *data, size_t size)
{
int tmp;
if (data != NULL)
{
for (int i = 0; i < size / 2; i++)
{
tmp = *(data + i);
*(data + i) = *(data + size - i - 1);
*(data + size - i - 1) = tmp;
}
}
return data;
}
ara[]withara[i]=ara[j];? Perhaps try this withint ara[] ={1,2,3,4}?int ara_r[10];..ara_r[i]=ara[j];printf("%d\n",ara_r[i]);