Untitled

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

void passOne(char label[10], char opcode[10], char operand[10], char code[10], char mnemonic[3]);
void display();

int main()
{
   
    char label[10], opcode[10], operand[10];
    
    char code[10], mnemonic[3];
   
    passOne(label, opcode, operand, code, mnemonic);

    return 0;
}

void passOne(char label[10], char opcode[10], char operand[10], char code[10], char mnemonic[3]) 
{
    int locctr, start, length;

    FILE *fp1, *fp2, *fp3, *fp4, *fp5;                                    

    
    fp1 = fopen("input.txt", "r");
    fp2 = fopen("optab.txt", "r");  
    fp3 = fopen("symtab.txt", "w");
    fp4 = fopen("intermediate.txt", "w");
    fp5 = fopen("length.txt", "w");
    fscanf(fp1, "%s\t%s\t%s", label, opcode, operand);              

    if (strcmp(opcode, "START") == 0) {                       
        
        start = atoi(operand);                                      
        locctr = start;
        fprintf(fp4, "\t%s\t%s\t%s\n", label, opcode, operand);     
        fscanf(fp1, "%s\t%s\t%s", label, opcode, operand);          
    } 
    else {
        locctr = 0;
    }

    
    while (strcmp(opcode, "END") != 0) {

        
        fprintf(fp4, "%d\t%s\t%s\t%s\n", locctr, label, opcode, operand);

         
        if (strcmp(label, "**") != 0) {
            fprintf(fp3, "%s\t%d\n", label, locctr);
        }

        
        fscanf(fp2, "%s\t%s", code, mnemonic);

        
        while (strcmp(code, "END") != 0) {
            if (strcmp(opcode, code) == 0) {                        
                locctr += 3;
                break;
            }
      
            fscanf(fp2, "%s\t%s", code, mnemonic);
        }
                      
        if (strcmp(opcode, "WORD") == 0) {
            locctr += 3;
        }
          
        else if (strcmp(opcode, "RESW") == 0) {
            locctr += (3 * (atoi(operand)));                       
        }
               
        else if (strcmp(opcode, "BYTE") == 0) {
            ++locctr;
        }

        else if (strcmp(opcode, "RESB") == 0) {
            locctr += atoi(operand);
        }

        fscanf(fp1, "%s\t%s\t%s", label, opcode, operand);
    }

    fprintf(fp4, "%d\t%s\t%s\t%s\n", locctr, label, opcode, operand);

    fclose(fp4);
    fclose(fp3);
    fclose(fp2);
    fclose(fp1);
    display();
    length = locctr - start;
    fprintf(fp5, "%d", length);
    fclose(fp5);
    printf("\nThe length of the code : %d\n", length);
}

void display() {

    char str;
    FILE *fp1, *fp2, *fp3;
    printf("\nThe contents of Input Table :\n\n");
    fp1 = fopen("input.txt", "r");
    str = fgetc(fp1);
    while (str != EOF) {
        printf("%c", str);
        str = fgetc(fp1);
    }
    fclose(fp1);
    printf("\n\nThe contents of Output Table :\n\n");
    fp2 = fopen("intermediate.txt", "r");
    str = fgetc(fp2);
    while (str != EOF) {
        printf("%c", str);
        str = fgetc(fp2);
    }
    fclose(fp2);

    printf("\n\nThe contents of Symbol Table :\n\n");
    fp3 = fopen("symtab.txt", "r");
    str = fgetc(fp3);
    while (str != EOF) {
        printf("%c", str);
        str = fgetc(fp3);
    }
    fclose(fp3);
}