ex20250421 - rlawjdaks/ex20250310_first GitHub Wiki

#include <stdio.h>
int main() {
	int n = 10;
	int* p = &n;

	printf("%d %d\n", n, *p);
	printf("%p %p\n", &n, &*p);
	printf("%p %p\n", &n+1, &*p+1);
}

#include <stdio.h>
int main() {
	char n = 10;
	char* p = &n;

	printf("%d %d\n", n, *p);
	printf("%p %p\n", &n, &*p);
	printf("%p %p\n", &n + 1, &*p + 1);
}

#include <stdio.h>
int main() {
	short n = 10;
	short* p = &n;

	printf("%d %d\n", n, *p);
	printf("%p %p\n", &n, &*p);
	printf("%p %p\n", &n + 1, &*p + 1);
}

#include <stdio.h>
void PrintData(int* p) {
	printf("%p %d\n", p, *p);
}
int main() {
	int n = 10;
	int* p = &n;

	PrintData(&n);
	PrintData(p);
}

#include <stdio.h>
void PrintData(int* p) {
	printf("%p %d\n", p, *p);
	*p = 200;
}
int main() {
	int n = 10;
	int* p = &n;

	PrintData(&n);
	PrintData(p);
}

#include <stdio.h>
void UpdateData(int* p, int data) {
	*p = data;
}
int main() {
	int n = 10;
	int* p = &n;

	UpdateData(&n, 50);
	printf("data : %d\n", n);
	UpdateData(p, 80);
	printf("data : %d\n", n);
}

#include <stdio.h>
int main () {
	//주소의 연산 : 정수 가감산
	int n = 10;

	printf("%p\n", &n);
	printf("%p\n", &n+1);
	printf("%p\n", &n+2);
}

#include <stdio.h>
int main() {
	//주소의 연산 : 정수 가감산
	double n = 10;

	printf("%p\n", &n);
	printf("%p\n", &n + 1);
	printf("%p\n", &n + 2);
	printf("%p\n", &n - 1);
}

#include <stdio.h>
int main() {
	//배열 , 배열의 주소 연산
	int a = 10;
	int b = 20;
	int arr[2] = { 10,20 };

	printf("%d %d\n", a, b);
	printf("%d %d\n", arr[0], arr[1]);
}

#include <stdio.h>
int main() {
	int arr[5] = { 10,20,30,40,50 };

	printf("%d %d %d %d %d\n",
		arr[0], arr[1], arr[2], arr[3], arr[4]);
	printf("%d\n", sizeof(arr[0]));
	printf("%d\n", sizeof(arr));
}

#include <stdio.h>
int main() {
	int arr[5] = { 10,20,30,40,50 };

	printf("%d\n", arr[0]);
	printf("%d\n", arr[1]);
	printf("%d\n", arr[2]);
	printf("%d\n", arr[3]);
	printf("%d\n", arr[4]);
	printf("\n");
}

#include <stdio.h>
int main() {
	int arr[5] = { 10,20,30,40,50 };

	for (int i = 0; i < 5; ++i)
		printf("%d", arr[i]);
	printf("\n");
}

#include <stdio.h>
int main() {
	int arr[5];

	arr[0] = 10;
	arr[1] = 20;
	arr[2] = 30;
	arr[3] = 40;
	arr[4] = 50;

	for (int i = 0; i < 5; ++i)
		printf("%d", arr[i]);
	printf("\n");
}

#include <stdio.h>
int main() {
	int arr[5];

	arr[0] = 1*10;
	arr[1] = 2*10;
	arr[2] = 3*10;
	arr[3] = 4*10;
	arr[4] = 5*10;

	for (int i = 0; i < 5; ++i)
		printf("%d", arr[i]);
	printf("\n");
}

#include <stdio.h>
int main() {
	int arr[5];
	for(int i=0, j=1; i < 5 ; ++i, ++j)
		arr[i] = j * 10;

	for (int i = 0; i < 5; ++i)
		printf("%d", arr[i]);
	printf("\n");
}

#include <stdio.h>
int main() {
	int arr[5];

	arr[0] = (0+1) * 10;
	arr[1] = (1+1) * 10;
	arr[2] = (2+1) * 10;
	arr[3] = (3+1) * 10;
	arr[4] = (4+1) * 10;

	for (int i = 0; i < 5; ++i)
		printf("%d", arr[i]);
	printf("\n");
}

#include <stdio.h>
int main() {
	int arr[5];
	for (int i = 0; i < 5; ++i) {
		arr[i] = (i + 1) * 10;
	}
	for (int i = 0; i < 5; ++i)
	printf("%d", arr[i]);
	printf("\n");
}

#include <stdio.h>
int main() {
	int arr[4] = { 10,20,30,40 };

	printf("%d %d %d %d\n", arr[0], arr[1], arr[2], arr[3]);
	printf("%p %p %p %p\n", &arr[0], &arr[1], &arr[2], &arr[3]);
}

#include <stdio.h>
int main() {
	char arr[2] = { 1,2 };
	double darr[3] = { 1.1, 2.2, 3.3 };

	printf("char array : %d\n", sizeof(arr));
	printf("double array : %d\n", sizeof(darr));
}

#include <stdio.h>
int main() {
	char arr[2] = { 1,2 };
	double darr[3] = { 1.1, 2.2, 3.3 };

	printf("%d %d\n", arr[0], arr[1]);
	printf("%g %g %g\n", darr[0], darr[1], darr[2]);
}

#include <stdio.h>
int main() {
	char arr[2] = { 1,2 };
	double darr[3] = { 1.1, 2.2, 3.3 };

	printf("%p %p\n", &arr[0], &arr[1]);
	printf("%p %p %p\n", &darr[0], &darr[1], &darr[2]);
}

#include <stdio.h>
int main() {
	int arr[4] = { 10,20,30,40 };
	int* p = NULL;

	p = &arr[0];

	printf("%d %d %d %d\n", arr[0], arr[1], arr[2], arr[3]);
	printf("%d\n", *p);
}

#include <stdio.h>
int main() {
	int arr[4] = { 10,20,30,40 };
	int* p = NULL;

	//p = &arr[0];
	p = &arr[2];

	printf("%d %d %d %d\n", arr[0], arr[1], arr[2], arr[3]);
	printf("%d\n", *p);
}

#include <stdio.h>
int main() {
	int arr[4] = { 10,20,30,40 };
	int* p = NULL;

	//p = &arr[0];
	p = &arr[2];

	printf("%d %d %d %d\n", arr[0], arr[1], arr[2], arr[3]);
	printf("%d\n", *p);
	printf("%d\n", *p + 1);
	printf("%d\n", *(p+1));
}

#include <stdio.h>
int main() {
	int arr[4] = { 10,20,30,40 };
	int* p = NULL;

	//p = &arr[0];
	p = &arr[2];

	printf("%d %d %d %d\n", arr[0], arr[1], arr[2], arr[3]);
	printf("%d\n", p[0]);
	printf("%d\n", p[0] + 1);
	printf("%d\n", p[1]);
}

#include <stdio.h>
int main() {
	int arr[4] = { 10,20,30,40 };
	int* p = NULL;

	p = &arr[0];
	//p = &arr[2];

	printf("%d %d %d %d\n", arr[0], arr[1], arr[2], arr[3]);
	printf("%d\n", p[0]);
	printf("%d\n", p[1]);
	printf("%d\n", p[2]);
	printf("%d\n", p[3]);
}

#include <stdio.h>
int main() {
	int arr[4] = { 10,20,30,40 };
	int* p = NULL;

	//p = &arr[0];
	//p = &arr[2];	
        p = &arr[3];

	printf("%d %d %d %d\n", arr[0], arr[1], arr[2], arr[3]);
	printf("%d\n", p[-3]);
	printf("%d\n", p[-2]);
	printf("%d\n", p[-1]);
	printf("%d\n", p[0]);
}