C program to convert string to integer: It is frequently required to convert a string to an integer in applications. String should consists of digits only and an optional '-' (minus) sign at beginning for integers. For string containing other characters we can stop conversion as soon as a non digit character is encountered but in our program we will handle ideal case when only valid characters are present in string. Library function atoi can be used to convert string to an integer but we will create our own function.
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C program
// C program to convert string to integer without using atoi function#include <stdio.h>
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- First you have to import the module using the below code. Code-block:: python. From word2number import w2n. Then you can use the wordtonum method to convert a number-word to numeric digits, as shown below.
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int main()
{
char a[100];
int n;
printf('Input a valid string to convert to integern');
scanf('%s', a);
n = toString(a);
printf('String = %snInteger = %dn', a, n);
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}
int toString(char a[]){
int c, sign, offset, n;
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if(a[0]'-'){// Handle negative integers
sign =-1;
}
if(sign -1){// Set starting position to convert
offset =1;
}
else{
offset =0;
}
How To Convert String To Int
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for(c = offset; a[c]!='0'; c++){
n = n *10+ a[c]-'0';
}
if(sign -1){
n =-n;
}
return n;
}
Similarly you can convert string to long.
Output of program: