How to convert string to int in c

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Solution 1:

#include<stdio.h>

#include<stdlib.h>

int main(){

    char str[50];

    int number;

    //Accepting a numer in string format

    printf("Enter any number as a string : ");

    scanf("%s",str);

   

    //Converting string into the number;

    number = atoi(str);

         if(number==0 && str[0]!='0')

             printf("\nInvalid number");

         else

             printf("\n Equivalent number is : %d",number);

    return 0;

}

Solution 2:

#include<stdio.h>

#include<ctype.h>

#include<stdlib.h>

#include<math.h>

char * toString(int);

int main(){

    int number;

    char *string;

    //Accepting a number from user

    printf("Enter any integer number : ");

    scanf("%d",&number);

    //Checking number is valid or not

    if(isdigit(number)==0){

         printf("\nInvalid number");

         //exit(1);  //to exit from program

    }

    //Converting int to string

    string = toString(number);

    //printing the string in console

    printf("\nEqivalent string: %s",string);

    return 0;   

}

//function to conver int into string

char * toString(int num){

    static char str[50];

    char *ptr =(char *) &num;

    int i,length=0,temp,le;

    temp=num;

    while(temp){

         temp = temp/10;

         length++;

    }

    le=length;

    printf("le %d",length);

    for(i=0;i<le;i++){

         printf("%d",num/pow(10,length) + 48);

         num= num + (pow(10,length--));

    }

    str[i]='\0';

    return str;

}

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