2020-09-15 03:13:09

#include<stdio.h>
#include<math.h>
int main()
{
	int i=1;
	int n;
	int s=0;
	printf("\nNhap n=");
	scanf("%d", &n);
		//dung while
	while(i<=n){
		s=s+i;
		i++;
	}
	//dung do...while
	do{
		s=s+i;
		i++;
	}
	while(i<=n);
	//dung for
	for(int i=1;i<=n;i++){
		s=s+i;
	}
	printf("\nTong S(n)=%d", s);
	return 0;
}

2020-09-15 03:11:26

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	//Bài 3: Tính S(n) = 1 + ½ + 1/3 + … + 1/n
	//cah 1 for

	float n , t ,i;
	t=0 ;
	i=1;
	
	printf(" nhap so n = ");
	scanf("%f",&n);
	
	for (i=1;i<=n;i++) {
		t=t+(1/i);
		printf("\n so n la: %f",t);
	}
	//cach 2 while
	
	float n , t ,i;
	t=0 ;
	i=1;
	printf(" nhap so n = ");
	scanf("%f",&n);
	while (i<=n) {
		t=t+(1/i);
		i++;
		printf("\n so n la: %f",t);
	}
	//cach 3 do while
 
 	float n , t ,i;
	t=0 ;
	i=1;
	
	printf(" nhap so n = ");
	scanf("%f",&n);
	do {
		t=t+(1/i);
		i++;
	} while (i<+n);
	printf("\n so n la:%f ",t);
	
	return 0;
}

2020-09-15 03:11:01

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
    //Bài 2: Tính S(n) = 1^2 + 2^2 + … + n^2
    // cach 1 for
	int n , t ,i;
	t=0 ;
	i=1;	
	printf(" nhap so n = ");
	scanf("%d",&n);
					
	for(i=1;i<=n;i++){
		t=t+i*i;
		printf(" so n la: %d",t);
	}	
	// cach 2 wile
	int n , t ,i;
	t=0 ;
	i=0;
	printf(" nhap so n = ");
	scanf("%d",&n);
	while (i<=n) {
		t=t+i*i;
		i++;
		printf("\n so n la: %d",t);}
	//cach 3 do while
		int n , t ,i;
	t=0 ;
	i=0;
	printf(" nhap so n = ");
	scanf("%d",&n);
	
	do{
		t=t+i*i;
		i++;
	}
		while (i<=n);
			printf("\n so n la: %d",t);	
	return 0;
}

2020-09-15 03:10:33

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

 int main(int argc, char *argv[]) {
    //Bài 1: Tính S(n) = 1 + 2 + 3 + … + n 
  
    //cach 1 for
	int n , t ,i;
	t=0 ;
	i=1;
	printf(" nhap so n = ");
	scanf("%d",&n);
	
	for (i=1;i<=n;i++) {
     t=t+i;
	printf("\n so n la: %d",t);	
	}
	
	//cach 2 while
   	int n , t ,i;
	t=0 ;
	i=0;
	printf(" nhap so n = ");
	scanf("%d",&n);
	while (i<=n) {
		t=t+i;
		i++;
		printf("\n so n la: %d",t);
	}
	
	//cach 3 do while
	int n , t ,i;
	t=0 ;
	i=0;
	printf(" nhap so n = ");
	scanf("%d",&n);
	
	do{
		t=t+i;
		i++;
	}
		while (i<=n);
			printf("\n so n la: %d",t);	

	return 0;	
}

2020-09-14 16:04:50

#include "bits/stdc++.h"

int main() {

	//BAI 5

	float n; scanf("%f", &n);
	float n2 = n, n3 = n;
	
	if (n < 0) printf("MATH ERROR!"), exit(0);
	
	//Cach 1:
	float s1 = 0;
	for (float i = 0; i <= n; i++) s1 += (1 / (2 * i + 1));
	printf("S1 = %.3f\n", s1);
	
	//Cach 2:
	float s2 = 0; 
	while (n2 >= 0) s2 += (1 / (n2 * 2 + 1)), n2--;
	printf("S2 = %.3f\n", s2);
	
	//Cach 3:
	float s3 = 0;
	do s3 += (1 / (n3 * 2 + 1)), n3--;
	while (n3 >= 0);
	printf("S3 = %.3f\n", s3);
	
	return 0;

}

2020-09-14 16:01:10

#include "bits/stdc++.h"

int main() {

	//BAI 4

	float n; scanf("%f", &n);
	float n2 = n, n3 = n;
	
	if (n <= 0) printf("MATH ERROR!"), exit(0);
	
	//Cach 1:
	float s1 = 0;
	for (float i = 1; i <= n; i++) s1 += (1 / (2 * i));
	printf("S1 = %.3f\n", s1);
	
	//Cach 2:
	float s2 = 0; 
	while (n2 > 0) s2 += (1 / (n2 * 2)), n2--;
	printf("S2 = %.3f\n", s2);
	
	//Cach 3:
	float s3 = 0;
	do s3 += (1 / (n3 * 2)), n3--;
	while (n3 > 0);
	printf("S3 = %.3f\n", s3);
	
	return 0;

}

2020-09-14 15:54:39

#include "bits/stdc++.h"

int main() {

	//BAI 3

	float n; scanf("%f", &n);
	float n2 = n, n3 = n;
	
	if (n <= 0) printf("MATH ERROR!"), exit(0);
	
	//Cach 1:
	float s1 = 0;
	for (float i = 1; i <= n; i++) s1 += (1 / i);
	printf("S1 = %.3f\n", s1);
	
	//Cach 2:
	float s2 = 0; 
	while (n2 > 0) s2 += (1 / n2), n2--;
	printf("S2 = %.3f\n", s2);
	
	//Cach 3:
	float s3 = 0;
	do s3 += (1 / n3), n3--;
	while (n3 > 0);
	printf("S3 = %.3f\n", s3);
	
	return 0;

}

2020-09-14 15:38:27

#include "bits/stdc++.h"

int main() {
	
	//BAI 2

	int n; scanf("%d", &n);
	int n2 = n, n3 = n;
	
	//Cach 1:
	int s1 = 0;
	for (int i = 1; i <= n; i++) s1 += pow(i, 2);
	printf("S1 = %d\n", s1);
	
	//Cach 2:
	int s2 = 0; 
	while (n2 > 0) s2 += pow(n2, 2), n2--;
	printf("S2 = %d\n", s2);
	
	//Cach 3:
	int s3 = 0;
	do s3 += pow(n3, 2);
	while (n3--);
	printf("S3 = %d\n", s3);

}

2020-09-14 14:16:14

#include<stdio.h>
#include<math.h>
int main()
//Cach for
{
	int n;
	printf("\nNhap n:");
	scanf("%d",&n);
	if (n<=0)
	printf("Khong tinh duoc");
	else{
		float tong=0;
		for (int i=1;i<=n;++i)
		tong= tong + (1.0/(2*i));
		printf("Tong day so do la %f",tong);
	}
	return 0;	
}
//Cach while
{
	{
	int n;
	printf("\nNhap n:");
	scanf("%d",&n);
	if (n<=0)
	printf("Khong tinh duoc");
	else{
		float tong=0;
		int i=1;
		while(i<=n){
		tong= tong + (1.0/(2*i));
		i++;
	    }
		printf("Tong day so do la %f",tong);
	}
	return 0;	
}
}
//Cach do..while
{
	int n;
	printf("\nNhap n:");
	scanf("%d",&n);
	if (n<=0)
	printf("Khong tinh duoc");
	else{
		float tong=0;
		int i=1;
		do{
		tong= tong + (1.0/(2*i));
		i++;
	    }while(i<=n);
		printf("Tong day so do la %f",tong);
	}
	return 0;	
}

2020-09-14 14:06:58

#include<stdio.h>
int main()
//Cach while
{
	int n;
	printf("Nhap n: ");
	scanf("%d",&n);
	if (n<=0){
		printf("Khong tinh duoc");
	}
	else{
		int i=1, tong=0;
		while(i<=n){
			tong=tong + i*i;
			i++;
		}
		printf("\nTong day so bang %d",tong);
	}
}
//Cach do..while
{
	int n;
	printf("Nhap n: ");
	scanf("%d",&n);
	if (n<=0){
		printf("Khong tinh duoc");
	}
	else{
		int i=1, tong=0;
		do{
			tong=tong + i*i;
			i++;	
		}while(i<=n);
		printf("\nTong day so bang %d",tong);
	}
	
}
//Cach for
{
	int n;
	printf("Nhap n: ");
	scanf("%d",&n);
	if (n<=0){
		printf("Khong tinh duoc");
	}
	else{
		int i,tong=0;
	    for(i=1;i<=n;i++)
	    tong=tong + i*i;
		printf("\nTong day so bang %d",tong);
	}
}