char *s = (char *) malloc(100);
char sa[100];

int main(int argc,char* argv[]){
char *s = (char *) malloc(20);
char sa[400] = {0};
int i ,count;
printf(" enter the number of chars to write: ");
scanf("%d",&count);
for (i=0;i<count;i++){
printf("%dn",i);
sa[i] = 'a';
//s[i] = 'a';
}
free(s);

}