#include <stdio.h>
#include <stdlib.h>
// Questão 11 - Desenvolver um código que calcule o CPF e o ISBN de um livro, utilizando as regras de congruência.
// Cálculo do primeiro dígito verificador do CPF
int calcular_digito_cpf(int numeros[], int tamanho) {
int soma = 0;
int pesos[9] = {10, 9, 8, 7, 6, 5, 4, 3, 2}; // Pesos para o primeiro dígito
for (int i = 0; i < tamanho; i++) {
soma += numeros[i] * pesos[i];
}
int digito = soma % 11;
if (digito < 2) {
return 0;
} else {
return 11 - digito;
}
}
// Cálculo do segundo dígito verificador do CPF
int calcular_segundo_digito_cpf(int cpf[]) {
int soma = 0;
int pesos[10] = {11, 10, 9, 8, 7, 6, 5, 4, 3, 2}; // Pesos para o segundo dígito
for (int i = 0; i < 10; i++) {
soma += cpf[i] * pesos[i];
}
int digito = soma % 11;
if (digito < 2) {
return 0;
} else {
return 11 - digito;
}
}
// Função para validar e calcular o CPF
void validar_cpf(int cpf[]) {
int primeiro_digito = calcular_digito_cpf(cpf, 9);
cpf[9] = primeiro_digito;
int segundo_digito = calcular_segundo_digito_cpf(cpf);
cpf[10] = segundo_digito;
// Imprime o CPF completo
printf("CPF: ");
for (int i = 0; i < 11; i++) {
printf("%d", cpf[i]);
}
printf("\n");
}
// Cálculo do dígito verificador do ISBN
char calcular_digito_isbn(int numeros[]) {
int soma = 0;
int pesos[9] = {10, 9, 8, 7, 6, 5, 4, 3, 2}; // Pesos para o ISBN
for (int i = 0; i < 9; i++) {
soma += numeros[i] * pesos[i];
}
// Cálculo do dígito verificador
int digito = soma % 11;
if (digito == 10) {
return 'X';
} else {
return digito + '0';
}
}
// Função para validar e calcular o ISBN
void validar_isbn(int isbn[]) {
char digito_verificador = calcular_digito_isbn(isbn);
// Imprime o ISBN completo
printf("ISBN: ");
for (int i = 0; i < 9; i++) {
printf("%d", isbn[i]);
}
printf("%c\n", digito_verificador);
}
int main() {
char cpf_input[12]; // Armazena os 11 números do CPF como string
char isbn_input[10]; // Armazena os 9 números do ISBN como string
// Para armazenar os números
int cpf[11];
int isbn[9];
// Entrar com os 9 primeiros números do CPF como uma string
printf("Digite os 9 primeiros números do CPF (sem espaços): \n");
scanf("%s", cpf_input);
for (int i = 0; i < 9; i++) {
cpf[i] = cpf_input[i] - '0'; // Converte o caractere para inteiro
}
validar_cpf(cpf);
// Entrar com os 9 primeiros números do ISBN como uma string
printf("Digite os 9 primeiros números do ISBN (sem espaços): \n");
scanf("%s", isbn_input);
for (int i = 0; i < 9; i++) {
isbn[i] = isbn_input[i] - '0'; // Converte o caractere para inteiro
}
validar_isbn(isbn);
return 0;
}
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C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.
When ever you want to perform a set of operations based on a condition if-else is used.
if(conditional-expression) {
// code
} else {
// code
}
You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to if-else-if ladder.
switch(conditional-expression) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
// code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.
data-type array-name[size];
data-type array-name[size][size];
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Two types of functions are present in C
Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,
User defined functions are the ones which are written by the programmer based on the requirement.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
//code
}