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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5.  
  6. /*99乘法表1
  7.  
  8. int main() {
  9.  
  10. 	int i,j;//宣告整數型態變數i,j
  11.  
  12. 	for(i=1;i<=9;i++)//外迴圈;i從1到9
  13.  
  14. 	{
  15.  
  16. 		for(j=1;j<=9;j++)//內迴圈;j從1到9
  17. 									cout<<j<<"*"<<i<<"="<<j*i<<"\t";//輸出
  18. 		cout<<"\n";//換行
  19.  
  20. 	}
  21.  
  22.  
  23. 	return 0;
  24.  
  25. }
  26.  
  27. */
  28.  
  29.  
  30.  
  31. /*99乘法表2
  32.  
  33. int main() {
  34.  
  35. 	int i,j;//宣告整數型態變數i,j
  36.  
  37. 	for(i=1;i<=9;i++)//外迴圈;i從1到9
  38.  
  39. 	{
  40.  
  41. 		for(j=1;j<=9;j++)//內迴圈;j從1到9
  42.  
  43. 			cout<<i<<"*"<<j<<"="<<j*i<<"\t";//輸出
  44.  
  45. 		cout<<"\n";//換行
  46.  
  47. 	}
  48.  
  49.  
  50. 	return 0;
  51.  
  52. }
  53. */
  54.  
  55. /*1-100找出偶數
  56. int main() {
  57.  
  58. 	int i,j=0;//宣告整數型態變數i,j
  59.  
  60. 	for(i=1;i<=100;i++)//i從1到100
  61.  
  62. 	{
  63.  
  64. 		if(i%2==0)//i除以2後取餘數是否為0
  65.  
  66. 		{
  67.  
  68. 			j++;
  69.  
  70. 			cout<<i<<"\t";
  71.  
  72. 		}
  73.  
  74. 	}
  75.  
  76. 	cout<<"\n共"<<j<<"個";
  77.  
  78. 	return 0;
  79.  
  80. }
  81. */
  82.  
  83.  
  84. /*1-100中，奇數有幾個？
  85. int main() {
  86.  
  87. 	int i,j=0;//宣告整數型態變數i,j
  88.  
  89. 	for(i=1;i<=100;i++)//i從1到100
  90.  
  91. 	{
  92.  
  93. 		if(i%2!=0)//i除以2後取餘數不為0
  94.  
  95. 		{
  96.  
  97. 			j++;
  98.  
  99. 			cout<<i<<"\t";
  100.  
  101. 		}
  102.  
  103. 	}
  104.  
  105. 	cout<<"\n共"<<j<<"個";
  106.  
  107. 	return 0;
  108.  
  109. }
  110. */
  111.  
  112. /*1-100中，質數有幾個？*/
  113.  
  114. int main() {
  115.  
  116. 	int i,j=0,k,flag=0;//宣告整數型態變數i,j,k,flag
  117.  
  118. 	for(i=1;i<=100;i++)//i從1到100
  119.  
  120. 	{
  121.  
  122. 		flag=0;
  123.  
  124. 		for(k=1;k<i;k++)
  125.  
  126. 			if(k!=1 && k!=i && i%k==0)
  127.  
  128. 				flag=1;
  129.  
  130. 		if(flag==0)
  131.  
  132. 		{
  133.  
  134. 			j++;
  135.  
  136. 			cout<<i<<"\t";
  137.  
  138. 		}
  139.  
  140. 	}
  141.  
  142. 	cout<<"\n共"<<j<<"個";
  143.  
  144. 	return 0;
  145.  
  146. }
Success #stdin #stdout 0.01s 5328KB
comments (?)
stdin 
Standard input is empty
stdout 
1	2	3	5	7	11	13	17	19	23	29	31	37	41	43	47	53	59	61	67	71	73	79	83	89	97	
共26個
https://ideone.com/P5PHUO
language:
C++ (gcc 8.3)
created:
14 days ago
visibility:
public

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