Program to perform string operations | ZOHO

Program to perform string operations. ie Operator precedence is not considered

Logic:

• Get the input from the user which contains numbers followed by operators.
• The count of numbers is n means then operators must be n-1 otherwise input will be wrong. ie.,123-+(correct)
• The operators and numbers don’t collide they must be in a separated manner ie.,1234-+1/(wrong)
• Take the first two elements to take the first operator to perform the operation.
• The result is assigned as the first element and the second element is the next number in input.
• At last print the result of the string operations.

Explanation:

• Let us consider input 1 ie,5742+-*
• First, check the given input is correct or not by using two conditions

1. Number length is n means and operator length is n-1

2. The starting letter of the string should be number and the number and operator should be in a separated manner ie, doesn’t collide

• For the above input satisfies both the conditions where n=4 and operator length is 3
• Take the first number and the second number using ASCII where b=5 and c=7 and k=4 which is the length of the numbers, then take the operator which is in k+0th position and perform the corresponding operation
• Now b=12 and c=4 then take the operator in k+1th position and perform the subtraction operation
• Now, b=8 and c=2 and the operator found in k+2th position is * and the result is 16
• Then print the output when no abnormal state is found

Program:

#include<stdio.h>
void main()
{
    //k is count of numbers
    //l is count of Operators
    //j act as a marker check collision ocuurs or not
    //d act as a marker for occurance of abnormal state
    //b, c contains first and second element for operations 
    char a[30];
    int i,j=0,n,k=0,l=0,c,b,d=1;
    scanf("%s",&a);
    n=strlen(a);
    for(i=0;i<n;i++)
    {
        if(a[i]>=48&&a[i]<=58)
        {
            if(l==0)
            {
                k++;            //length of number
            }
            else
            {
            	j=1;           //wrong input ie 123*1/+
                break;
            }
        }
        else
        {
           l++;
        }
    }
    if(k!=l+1||j==1)           //wrong input ie 1234*/
    {
        printf("Input wrong");
    }
    else
    {
        l=0;
        b=a[0]-48;            //first element for arithmetic operation
        for(i=1;i<k;i++)
        {
            c=a[i]-48;        //second element for arithmetic operation
            switch(a[k+l])    //select the operator
            {                 //b is assigned as first element for every time
                case '+':
                    b=b+c;
                    break;
                case '-':
                    b=b-c;
                    break;
                case '*':
                    b=b*c;
                    break;
                case '/':
                    if(c==0)  //abnormal state of 1/0 error
                    {
                        printf("Abnormal state");
                        d=0;
                    }
                    b=b/c;
                    break;
            }
            if(d==0)
            {
                break;
            }
            l++;             //switch to next operator
        }
        if(d!=0)             //print the result
        {
            printf("%d",b);
        }
    }
}

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