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#include <stdio.h>
#include <locale.h>
#include <math.h>
#include <string.h>
 
int opoc(char *a)
 
{setlocale(LC_CTYPE, "Russian");
int k, s=0, i;
k = strlen(a)-1;
for(i=0; a[i]!='\0'; ++i)
{
if(a[i]=='1')
s = s+pow(2,j);
j--;
}
return s;
}
int main() {
  setlocale(LC_CTYPE, "Russian");
char z[1000];
printf("Введите двоичное число:");
gets(z);
printf("%d\n",opoc(z));
return 0;
}
 

prog.c: In function ‘opoc’:
prog.c:14:13: error: ‘j’ undeclared (first use in this function)
 s = s+pow(2,j);
             ^
prog.c:14:13: note: each undeclared identifier is reported only once for each function it appears in
prog.c:9:5: warning: variable ‘k’ set but not used [-Wunused-but-set-variable]
 int k, s=0, i;
     ^
prog.c: In function ‘main’:
prog.c:23:1: warning: implicit declaration of function ‘gets’ [-Wimplicit-function-declaration]
 gets(z);
 ^~~~

Standard output is empty