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#include <stdio.h>
int main(){
    int a[5],b[5];
    a[]={2,3,4,5,6};
 
    for(int i=1;i<=4;i++)
    {
        b[i]=a[i-1]*a[i+1];
    }
    b[0]=a[0]*a[1];
    b[4]=a[4]*a[3];
    for(int j=0;j<5;j++){
        printf("%d",b[i]);
    }
}

prog.c: In function ‘main’:
prog.c:4:7: error: expected expression before ‘]’ token
     a[]={2,3,4,5,6};
       ^
prog.c:13:23: error: ‘i’ undeclared (first use in this function)
         printf("%d",b[i]);
                       ^
prog.c:13:23: note: each undeclared identifier is reported only once for each function it appears in
prog.c:3:14: warning: variable ‘b’ set but not used [-Wunused-but-set-variable]
     int a[5],b[5];
              ^

Standard output is empty