the correct syntax for ''char'' type

hi have to make a simple calculator for my prog course but the teacher didn't give the explanation about the char type

so my prog will look like this

Code:

---


int main (void)

{
   
    float a,b,c;
    char operation[1];
 
    printf("Calculatrice de base\n entre les operation sous la forme a () b");
    printf("\n***************************");
    printf("\n + (addition)            *");
    printf("\n - (soustraction)        *");
    printf("\n * (multiplication)      *");
    printf("\n / (division)            *");
    printf("\n t (terminer le programme)*");
    printf("\n***************************\n");
     
    scanf("%f",&a);
    scanf("%s",operation);
    scanf("%s",b);
   
    if (operation=='+')
        printf("\n %f + %f = %f",a,b,(a+b));
   
    if (operation=='-')
      printf("\n %f - %f = %f",a,b,(a-b));
   
    if (operation=='*')
      printf("\n %f * %f = %f",a,b,(a*b));
   

    if (operation=='/')
      {if (b==0)
        printf("division pas 0 impossible !!!");
        else printf("\n %f / %f = %f",a,b,(a/b));
      }
    if (operation=='t')
        return 0;
   
       
   
    getch();
    return 0;
}

---

EROR MESSAGE:
[Warning] comparison between pointer and integer

at each ''if''



i don't want you to programm it but can you tell me the correct way to write the char declaration and if i can do a comparison with char like i did if yes, how to do it correctly

Hello,

The char data type is a single byte, capable of holding one character in the local character set. Your implementation, however, represents a character array. Arrays are a series of elements (variables) of the same type placed consecutively in memory that can be individually referenced by adding an index to a unique name.

That means that, for example, we can store 5 values of type char without having to declare 5 different variables each with a different identifier. Instead, using an array we can store 5 different values of the same type, char for example, with a unique identifier.

Code:

---

char item[5];

Index    Position
item[0]  First
item[1]  Second
item[2]  Third
item[3]  Fourth
item[4]  Fifth

---

These are numbered from 0 to 4 since in arrays the first index is always 0, independently of its length. Thus, your implementation should become clear why your compiler returns a warning:

Code:

---

if (operation=='+')

---

Your character array operation is being checked against a single byte. Rather, you should keep the comparisions within the same boundaries:

Code:

---

char operation;
scanf("%c", &operation);

---

If you want to use an array, you can do the following while subscripting your arrays, [0], [1], etc...


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