C++ Program For First Come First Served (FCFS) Scheduling Algorithm

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

int strToint (char[]);

int main()
{

    while(1)
    {
    char str[10];
    int intNum;

    printf("\n\nEnter Integer Number: ");
    scanf("%s",str);

    intNum = strToint(str);

 if(intNum==0)
 {
 printf("\nEnter The Number Not String\n\n");
 }
 else
    {
     printf("\n\nEquivalent Integer Value: %d",intNum);
 }
 }
 
return 0;
}

int strToint (char str[])
{

    int i=0,sum=0;

    while(str[i] != '\0')
  {

        if(str[i] < 48 || str[i] > 57)
   {
            printf("\n\nCan't Convert Into Integer");
            return 0;
        }
        else
   {
            sum = sum*10 + (str[i] - 48);
            i++;
        }
    }

return sum;

}

return sum;

}

Output: