basic C

if

	#include <stdio.h>
	int main(){
	int i;
	printf("input num : ");
	scanf("%d", &i);
	if(i < 5)
	printf("input num < 5\n");
	else if(i == 5)
	printf("input num : %d\n", i);
	else
	printf("input bum > 5\n");
	return 0;
	}

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for

	#include <stdio.h>
	int main(){
	int i;
	for(i = 0; i < 10; i++){
	printf("i : %d\n", i);
	}
	return 0;
	}

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while

	#include <stdio.h>
	int main(){
	int i=0;
	while(i < 10){
	printf("i : %d\n", i);
	i = i + 1;
	}
	return 0;
	}

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array

	#include <stdio.h>
	int main(){
	int i;
	char buf[20] = "Life is too short!";
	printf("%s\n", buf);
	for(i = 0; i < 20; i++)
	printf("%c", buf[i]);
	printf("\n");
	return 0;
	}

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pointer

	#include <stdio.h>
	int main(){
	int a = 123;
	int *b;
	b = &a;
	printf("a = %d\n", a);
	printf("&a = 0x%x\n", &a);
	printf("b = 0x%x\n", b);
	printf("&b = 0x%x\n", &b);
	printf("*b = %d\n", *b);
	return 0;
	}

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function

	#include <stdio.h>
	int addVal(int i, int j){
	int sum = 0;
	sum = i + j;
	return sum;
	}
	int main(){
	int a, b, sum;
	printf("input num1 : ");
	scanf("%d", &a);
	printf("input num2 : ");
	scanf("%d", &b);
	sum = addVal(a, b);
	printf("input num1 + input num2 = %d\n", sum);
	return 0;
	}

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