this c program not running properly

Question

I made a program to determine second largest element in an array:-
#include<stdio.h>
#include<conio.h>

int main()
{
int a[10],i,j,l=0,b;
for(i=0;i<10;i++)
{
scanf("%d",&a[i]);
}

for(i=0;i<10;i++)
{
for(j=0;j<10;j++)
{
if(a[i]<a[j]&&a[j]!=b)
{
l++;
b=a[i];
}

}

if(l==1)
{
printf("Second largest = %d",a[i]);
break;
}

}
return 0;
}

but it is not printing anything. why? pls help.

Answer 1

Are you trying to run this using Code Playground?

Answer 2

//Try this.
//Just FYI, C++ is backwards compatible with C, but loops and input does not work well on Code Playground. scanf() is also not recognised.
// This works, but you have to modify it to take user input.

#include<stdio.h>

int main()
{
int a[10] = {1,2,4,3,9,8,0,5,6,7};

for (int i = 0; i < 10; i++)
for (int j = 0; j < 10 - 1 - i; j++)
if (a[j] < a[j + 1])
{
int temp = a[j];
a[j] = a[j + 1];
a[j + 1] = temp;
}
printf("Second largest = %d",a[1]);
return 0;
}

Answer 3

For one, b was never initialized.

Answer 4

it will work in c++

Answer 5

hasty is right , you can make it using any type of sorting and then simply displaying the second element of the array by using a[1].

Answer 6

run in in c++

Answer 7

what is wrong with my code but.

Answer 8

This version does not modify the order of data, you can use this version (it also go through the array only once)
#include <stdio.h>
/*for random*/
#include <stdlib.h>
#include <time.h>

#define SIZE 10

int main(){
int a[SIZE], min[2];
unsigned i;

if(SIZE >= 2){
/*randomely initializing the array*/
srand(time(0));
puts("Your array is :");
for(i = 0; i < SIZE; ++i){
a[i] = rand();
printf("%d\n",a[i]);
}
putchar('\n');

/*now we find the second minimum without changing the array*/
if(a[0] > a[1]){
min[0] = a[1];
min[1] = a[0];
}else{
min[0] = a[0];
min[1] = a[1];
}

for(i = 2; i < SIZE; ++i){
if(a[i] < min[1]){
if(a[i] < min[0]){
min[1] = min[0];
min[0] = a[i];
}else
min[1] = a[i];
}
}

printf("Second minimum is %d\n",min[1]);
}else
puts("The array can't have a second minimum as its size is lower than 2.");

return 0;
}

Answer 9

no. code playground don't have c

Answer 10

why is code not working but?