How to convert string to int in c









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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