Answer:
scanf(" %c" ,&op); //entering operators such as + - \ *
Explanation:
put space before %c
 
        
             
        
        
        
Answer:
Following is the program in C language :
#include <stdio.h> // header file
#define n 5 //  macro
int main() main function 
{
    int a[n],k1; // variable and array declaration
    printf("Enter the element:\n");
    for(k1=0;k1<n;++k1) //iterating the loop
    {
        scanf("%d",&a[k1]);//Read the values by user
    }
    printf("Output in Reverse Order:\n");
    for(k1=n-1;k1>=0;--k1)//iterating the loop
    {
    printf(" %d ",a[k1]); //Display the values
    }
    return 0;
}
Output:
Enter the element:
4
3 
45
67
89
Output in Reverse Order: 89 67 45 3 4
Explanation:
Following is the description of the program
- Define a macro "n" with value 5 after the header file.
- Declared an array "a" and defined the size of that array by macro i.e "n".
- Read the value by the user by using scanf statement in the array "a"
- Finally In the last for loop display the values of array "a" by space. 
 
        
             
        
        
        
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