//Array and counter//
#include<stdio.h>
int main (void)
{
int counter,number[21];
for(counter=0; counter<21; counter++)
number[counter]=0;
for(counter=0; counter<21; counter++)
number[counter]=counter;
for(counter=0; counter<21; counter++)
{
printf("number[%d]=%d\n",counter,number[counter]);
}
return 0;
}

number[0]=0
number[1]=1
number[2]=2
number[3]=3
number[4]=4
number[5]=5
number[6]=6
number[7]=7
number[8]=8
number[9]=9
number[10]=10
number[11]=11
number[12]=12
number[13]=13
number[14]=14
number[15]=15
number[16]=16
number[17]=17
number[18]=18
number[19]=19
number[20]=20