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39 changes: 39 additions & 0 deletions src/examples/demo_presentation.c
Original file line number Diff line number Diff line change
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/*
* Programa-demo para a apresentação final (issue #163).
*
* Mostra, em poucas linhas, os recursos centrais já estáveis do
* subconjunto de C suportado pelo compilador:
* - variaveis e expressoes aritmeticas
* - funcoes com chamada recursiva (factorial)
* - controle de fluxo: if/else e while
*
* Saida esperada: exit code 80
* factorial(4) = 24
* sum_even_squares(6) = 2*2 + 4*4 + 6*6 = 56
* 24 + 56 = 80
*/

int factorial(int n) {
if (n <= 1) {
return 1;
}
return n * factorial(n - 1);
}

int sum_even_squares(int n) {
int total = 0;
int i = 1;
while (i <= n) {
if (i % 2 == 0) {
total = total + i * i;
}
i = i + 1;
}
return total;
}

int main(void) {
int fact4 = factorial(4);
int squares = sum_even_squares(6);
return fact4 + squares;
}
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