/***********************************************
* Section : 15
* Machine No. : N
* Roll No. : 19CS100XY
* Name : Aritra Hazra
* Assignment No : 2
* Description : Subject Marks in English Words
                & Absolute and Relative Grading
***********************************************/

#include <stdio.h>

int main ()
{
    int roll, attend, marks, backlog, type, errorFlag = 0;
    /* initialized using default absolute cut-offs */
    int exCut = 90, aCut = 80, bCut = 70, cCut = 60, dCut = 50, pCut = 40;

    /* entering student roll-number and attendance */
    printf("++ Enter Student Roll Number: ");
    scanf("%d", &roll);
    printf("++ Enter the Attendance Percentage: ");
    scanf("%d", &attend);
    /* check for poor attendance and dis-qualification */
    if ( (attend < 0) || (attend > 100) )
        printf("-- Error: Mistake in Attendance Record!\n");
    else if (attend < 80)
        printf("-- The Grade of %d is: F (Shortage in Attendance!)\n", roll);
    else { /* attendance lie within range [80-100] */
        /* entering subject marks */
        printf("++ Enter Subject Marks (out of 100): ");
        scanf("%d", &marks);
        if (marks > 100)
            printf("-- Error: Mistake in Marks Record!\n");
        else { /* marks given within range [0-100] */
            printf("++ Is this marks for Supplementary / Backlog Examination? (Type '0' if NOT): ");
            scanf("%d", &backlog);

            /* option for relative grading */
            printf("++ Do you want Relative Grading? (Type '0' if NOT): ");
            scanf("%d", &type);
            if (type) {
                /* setting cut-off marks for relative grading */
                printf("++ Set Cut-off Parameters:\n");
                printf("\t++ Cut-off for EX = ");
                scanf("%d", &exCut);
                printf("\t++ Cut-off for  A = ");
                scanf("%d", &aCut);
                printf("\t++ Cut-off for  B = ");
                scanf("%d", &bCut);
                printf("\t++ Cut-off for  C = ");
                scanf("%d", &cCut);
                printf("\t++ Cut-off for  D = ");
                scanf("%d", &dCut);
                printf("\t++ Cut-off for  P = ");
                scanf("%d", &pCut);

                /* checking for any error in setting cut-offs during relative grading */
                if (exCut > 100) {
                    printf("-- Error: Cut-off for 'EX' is beyond Maximum Marks Limit!\n");
                    errorFlag = 1;
                }
                if (aCut >= exCut) {
                    printf("-- Error: Cut-off for 'A' is not less than Cut-off for 'EX'!\n");
                    errorFlag = 1;
                }
                if (bCut >= aCut) {
                    printf("-- Error: Cut-off for 'B' is not less than Cut-off for 'A'!\n");
                    errorFlag = 1;
                }
                if (cCut >= bCut) {
                    printf("-- Error: Cut-off for 'C' is not less than Cut-off for 'B'!\n");
                    errorFlag = 1;
                }
                if (dCut >= cCut) {
                    printf("-- Error: Cut-off for 'D' is not less than Cut-off for 'C'!\n");
                    errorFlag = 1;
                }
                if (pCut >= dCut) {
                    printf("-- Error: Cut-off for 'P' is not less than Cut-off for 'D'!\n");
                    errorFlag = 1;
                }
                if (pCut < 0) {
                    printf("-- Error: Cut-off for 'EX' is beyond Minimum Marks Limit!\n");
                    errorFlag = 1;
                }
            }

            /* printing grade if there is no error in the input */
            if (!errorFlag) {
                printf("-- The Subject Marks of %d is: ", roll);

                /* generating the marks in English word format */
                if (marks == 0) // if marks is 0
                    printf("Zero");
                else if (marks == 100) /* if marks is 100 */
                    printf("Hundred");
                else if (marks/10 == 1){ /* marks within 10-19 */
                    switch (marks%10){ /* word generation for 10-19 */
                        case 0: printf("Ten");       break;
                        case 1: printf("Eleven");    break;
                        case 2: printf("Twelve");    break;
                        case 3: printf("Thirteen");  break;
                        case 4: printf("Forteen");   break;
                        case 5: printf("Fifteen");   break;
                        case 6: printf("Sixteen");   break;
                        case 7: printf("Seventeen"); break;
                        case 8: printf("Eighteen");  break;
                        case 9: printf("Nineteen");  break;
                    }
                }
                else { /* marks other than 0, 100, 10-19 */
                    switch (marks/10){ /* word generation for decimal part */
                        case 2: printf("Twenty ");  break;
                        case 3: printf("Thirty ");  break;
                        case 4: printf("Forty ");   break;
                        case 5: printf("Fifty ");   break;
                        case 6: printf("Sixty ");   break;
                        case 7: printf("Seventy "); break;
                        case 8: printf("Eighty ");  break;
                        case 9: printf("Ninety ");  break;
                        default: /* do nothing */   break;
                    }
                    switch (marks%10) { /* word generation for unitary part */
                        case 0: printf("\b");       break;
                        case 1: printf("One");      break;
                        case 2: printf("Two");      break;
                        case 3: printf("Three");    break;
                        case 4: printf("Four");     break;
                        case 5: printf("Five");     break;
                        case 6: printf("Six");      break;
                        case 7: printf("Seven");    break;
                        case 8: printf("Eight");    break;
                        case 9: printf("Nine");     break;
                    }
                }

                if (!type)
                    printf("\n-- The Absolute Grade of %d is: ", roll);
                else
                    printf("\n-- The Relative Grade of %d is: ", roll);

                /* provision for normal as well as backlog grades (one less than normal) */
                if (marks >= exCut)
                    (!backlog)? printf("EX\n") : printf("A\n");
                else if (marks >= aCut)
                    (!backlog)? printf("A\n")  : printf("B\n");
                else if (marks >= bCut)
                    (!backlog)? printf("B\n")  : printf("C\n");
                else if (marks >= cCut)
                    (!backlog)? printf("C\n")  : printf("D\n");
                else if (marks >= dCut)
                    (!backlog)? printf("D\n")  : printf("P\n");
                else if (marks >= pCut)
                    (!backlog)? printf("P\n")  : printf("F\n");
                else
                    printf("F\n");
            }
        }
    }

    return 0;
}