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  1. #include<stdio.h>
  2.  
  3. struct Contact{
  4. 	int No;
  5. 	char name [20];
  6. 	char phoneNumber[30];
  7. 	char Email_address[45];
  8. };
  9.  
  10. void Emptydata(int max,FILE *f)
  11. {
  12. 	unsigned int i;
  13.  
  14. 	struct Contact EmptyContact = {0,"","",""};
  15.  
  16. 	for(i=1;i<=100;++i)
  17. 	{
  18. 		fwrite(&EmptyContact, sizeof(struct Contact),1,f);
  19. 	}
  20. }
  21. int main(void)
  22. {
  23. 	int user;
  24. 	int counter=0;
  25. 	int numOfRecord=0,iterator=0;
  26. 	FILE *f;
  27.  
  28. 	f=fopen("Contact.dat","wb+");
  29. 	Emptydata(50,f);
  30.  
  31. 	struct Contact c[2]={{1,"Ariel","0981-154-203","Tong@gmail.com"},{2,"Chubao","0910-653-758","Chu@gmail.com"}};
  32. 	fseek(f,0,SEEK_SET);
  33. 	fwrite(c,sizeof(struct Contact),sizeof(c)/sizeof(struct Contact),f);
  34. 	fclose(f);
  35.  
  36.  
  37. 	printf("Enter the number of option you want(1 for read the existing contact, 2 for add new contact.)\n");
  38. 	scanf("%d",&user);
  39.  
  40. 	if(user==1)
  41. 	{
  42. 		f=fopen("Contact.dat","rb");
  43. 		fseek(f,0,SEEK_END);
  44.  
  45. 		numOfRecord=ftell(f)/sizeof(struct Contact);
  46. 		rewind(f);
  47.  
  48. 		struct Contact c[numOfRecord];
  49. 		fread(c,sizeof(struct Contact),numOfRecord,f);
  50.  
  51. 		for(iterator=0;iterator<numOfRecord;++iterator)
  52. 		{
  53. 			printf("%d%10s%20s%20s\n",c[iterator].No,c[iterator].name,c[iterator].phoneNumber,c[iterator].Email_address);
  54. 		}
  55. 	}
  56. 	if(user==2)
  57. 	{
  58. 		f=fopen("Contact.dat","r+b");
  59.  
  60. 		struct Contact New ={0,"","",""};
  61.  
  62. 		printf("Enter your name,phone number,and email address.\n");
  63. 		fscanf(stdin,"%10s%20s%20s",New.name,New.phoneNumber,New.Email_address);
  64.  
  65. 		counter++;
  66. 		fseek(f,(counter+2)*sizeof(struct Contact),SEEK_END);
  67.  
  68. 		numOfRecord=ftell(f)/sizeof(struct Contact);
  69. 		rewind(f);
  70.  
  71. 		fwrite(&New,sizeof(struct Contact),numOfRecord-2,f);
  72.  
  73. 		struct Contact c[numOfRecord];
  74. 		fread(c,sizeof(struct Contact),numOfRecord,f);
  75.  
  76. 		for(iterator=0;iterator<numOfRecord;++iterator)
  77. 		{
  78. 			printf("%s%20s%20s\n",c[iterator].name,c[iterator].phoneNumber,c[iterator].Email_address);
  79. 		}
  80. 	}
  81. 	fclose(f);
  82. }
Runtime error #stdin #stdout 0s 9432KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/V77r5T
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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