error: assignement to Expression with array type

Question

I am trying to compile the code below for a list of exercises of my course introduction to programming but the codeblocks presents the error quoted in the title when I try to compile the code.

#include<stdio.h>
int main(){
    float peso,altura,imc;
    char nome[40],categoria[40];

    printf("Qual o nome da pessoa? ");
    fflush(stdin);
    gets(nome);

    printf("\nQual a altura dessa pessoa em metros? ");
    scanf("%f",&altura);

    printf("\nQual o peso dessa pessoa em kilos? ");
    scanf("%f",&peso);

    imc=peso/(altura*altura);

    if(imc<18.5){
        categoria='abaixo do peso';
    }

    if((18.5<=imc)&&(imc<25)){
        categoria='peso normal';
    }

    if((25<=imc)&&(imc<30)){
        categoria='acima do peso';
    }

    if(imc>=30){
        categoria='obesidade';
    }

    printf("\n%s esta com indice de massa corporal %f(%s)", nome, imc, categoria);

    return 0;
}

Answer 1

The problem is here:

categoria='abaixo do peso';

For starters it has to be double quotes " instead of single quotes ', and also cannot be assigned directly as you are doing.

To copy text to the array of char which has, must use the function strcpy:

strcpy(categoria, "abaixo do peso");
//       ^--- destino      ^--- texto a copiar

Since this function is part of the string library it is important to import it at the top:

#include <string.h>

Must apply the strcpy other parts of the code that had the same problem.

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As a recommendation for the future, avoid at all costs using the function gets, because she’s not safe.