This program is compiling just fine but is not running. Even, Main is not initializing,

Here is my code

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int pow2(int n) {
printf("POW2");
int pow = 1;
while(n <= pow) {
if (n < pow) {
return 0;
}
else if(n == pow) {
return 1;
}
else pow = pow * 2;
}
return 0;
}
int average(int c[], int len) {
printf("average");
int *firstHalf = c;
int *secondHalf = c + (len/2);
/*if((len%2) != 0) {
int *firstHalf = c;
int *secondHalf = c + (len/2);
return (average(firstHalf, (len/2)) + average(secondHalf,(len/2)))/2);
}*/
return (average(firstHalf, (len/2))+average(secondHalf,(len/2))/2);
}
/* ********************************************************* MAIN */
int main(int argc, char **argv) { printf ("MAIN");
int c[100];
int size;
int i;
int sum;
float avg;
i = 0;
size = 0;
sum = 0;
avg = 0;
/* LER OPERAÇÃO */
printf ("antes while");
char currentOp[1]; printf ("antes while");
while(strcmp(argv[i],"\0") != 0) {printf ("durante while");
i++;
strcpy(currentOp,argv[i]);
if(currentOp[0] == 'a') { /* ADD */
i++;
c[size] = atoi(argv[i]);
size++;
sum += c[size];
if(pow2(sum) == 1) {
avg = average(c,size);
printf("%.3f\n", avg);
}
}
else if(currentOp[0] == 'r') { /* REMOVE */
int j;
int y;
j = 0;
y = 0;
i++;
int current = atoi(argv[i]);
for (j=0; j<size; j++) {
if (c[j] == current) {
for(y=j; y<size; y++) {
c[y] = c[y+1];
}
sum = sum - current;
size--;
}
}
if(pow2(sum) == 1) {
avg = average(c,size);
printf("%.3f\n", avg);
}
}
else { /* REPLACE */
int old;
int new;
int k;
k = 0;
i++;
old = atoi(argv[i]);
i++;
new = atoi(argv[i]);
if (new != old) {
for (k=0; k<size; k++) {
if(c[k] == old) {
c[k] = new;
sum = sum - old + new;
}
}
}
if (pow2(sum) == 1) {
avg = average(c,size);
printf("%.3f\n", avg);
}
}
}
return 0;
}

Thanks for your help.