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This C Program Updates the Details of Employee using Files.

Here is source code of the C Program to Update Details of Employee using Files. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

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  1. /*
  2.  * C Program to Update Details of Employee using Files
  3.  */
  4. #include <stdio.h>
  5. #include <stdlib.h>
  6. #include <string.h>
  7. struct emp
  8. {
  9. int empid;
  10. char*name;
  11. };
  12.  
  13. int count =0;
  14. void add_rec(char*a);
  15. void display(char*a);
  16. void update_rec(char*a);
  17.  
  18. void main(int argc,char*argv[])
  19. {
  20. int choice;
  21. while(1)
  22. {
  23. printf("MENU:\n");
  24. printf("1.Add a record\n");
  25. printf("2.Display the file\n");
  26. printf("3.Update the record\n");
  27. printf("Enter your choice:");
  28. scanf("%d",&choice);
  29.  
  30. switch(choice)
  31. {
  32. case1:
  33. add_rec(argv[1]);
  34. break;
  35. case2:
  36. display(argv[1]);
  37. break;
  38. case3:
  39. update_rec(argv[1]);
  40. break;
  41. case4:
  42. exit(0);
  43. default:
  44. printf("Wrong choice!!!\nEnter the correct choice\n");
  45. }
  46. }
  47. }
  48.  
  49. void add_rec(char*a)
  50. {
  51. FILE *fp;
  52. fp =fopen(a,"a+");
  53. struct emp *temp =(struct emp *)malloc(sizeof(struct emp));
  54. temp->name =(char*)malloc(50*sizeof(char));
  55. if(fp == NULL)
  56. printf("Error!!!");
  57. else
  58. {
  59. printf("Enter the employee id\n");
  60. scanf("%d",&temp->empid);
  61. fwrite(&temp->empid,sizeof(int),1, fp);
  62. printf("enter the employee name\n");
  63. scanf(" %[^\n]s", temp->name);
  64. fwrite(temp->name,50,1, fp);
  65. count++;
  66. }
  67. fclose(fp);
  68. free(temp);
  69. free(temp->name);
  70. }
  71.  
  72. void display(char*a)
  73. {
  74. FILE *fp;
  75. char ch;
  76. int rec = count;
  77. fp =fopen(a,"r");
  78. struct emp *temp =(struct emp *)malloc(sizeof(struct emp));
  79. temp->name =(char*)malloc(50*sizeof(char));
  80. if(fp == NULL)
  81. printf("Error!!");
  82. else
  83. {
  84. while(rec)
  85. {
  86. fread(&temp->empid,sizeof(int),1, fp);
  87. printf("%d", temp->empid);
  88. fread(temp->name,50,1, fp);
  89. printf(" %s\n", temp->name);
  90. rec--;
  91. }
  92. }
  93. fclose(fp);
  94. free(temp);
  95. free(temp->name);
  96. }
  97.  
  98. void update_rec(char*a)
  99. {
  100. FILE *fp;
  101. char ch, name[5];
  102. int rec, id, c;
  103. fp =fopen(a,"r+");
  104. struct emp *temp =(struct emp *)malloc(sizeof(struct emp));
  105. temp->name =(char*)malloc(50*sizeof(char));
  106. printf("Enter the employee id to update:\n");
  107. scanf("%d",&id);
  108. fseek(fp,0,0);
  109. rec = count;
  110. while(rec)
  111. {
  112. fread(&temp->empid,sizeof(int),1, fp);
  113. printf("%d", temp->empid);
  114. if(id == temp->empid)
  115. {
  116. printf("Enter the employee name to be updated");
  117. scanf(" %[^\n]s", name);
  118. c =fwrite(name,50,1, fp);
  119. break;
  120. }
  121. fread(temp->name,50,1, fp);
  122. rec--;
  123. }
  124. if(c ==1)
  125. printf("Record updated\n");
  126. else
  127. printf("Update not successful\n");
  128. fclose(fp);
  129. free(temp);
  130. free(temp->name);
  131. }
$ cc file5.c $ a.out empl MENU: 1.Add a record 2.Display the file3.Update the record Enter your choice:1 Enter the employee id1 enter the employee name aaa MENU: 1.Add a record 2.Display the file3.Update the record Enter your choice:1 Enter the employee id2 enter the employee name bbb MENU: 1.Add a record 2.Display the file3.Update the record Enter your choice:3 Enter the employee id to update: 1 1Enter the employee name to be updated1bc Record updated MENU: 1.Add a record 2.Display the file3.Update the record Enter your choice:21 1bc 2 bbb MENU: 1.Add a record 2.Display the file3.Update the record Enter your choice:4
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