C Program to Convert String to Integer Without Using Library Function atoi()

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Explanation:-

here we are converting a string to integer without using an atoi library function, first pass the string to a function and then compare with the first if else condition if condition is true then we can not convert a string into integer and if the condition is false then we can convert a string to integer number. Here we took an input number as a string, not as an integer that is why we have to convert the number to an integer or if we input the string then we cannot convert it.

#include<stdio.h> #include<string.h> int strToint (char[]); int main() { printf("====================================="); printf("\nnerdutella.com"); printf("\n====================================="); 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; }

C Program to Convert String to Integer Without Using Library Function atoi()

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String in C Programs

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