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Atoll

Item Value Header filestdlib.h Declarationlong long int atoll(const char *str); Functionconverts the string pointed to by str into a long long int value. It is otherwise similar to atol(). #include <stdlib.h>   #include <stdio.h>   int main(void)   {     char num1[80], num2[80];     printf("Enter first: ");     gets(num1);     printf("Enter second: ");     gets(num2);     printf("The sum is: %ld.", atoll(num1)+atoll(num2));     return 0;   } Enter first: 1 Enter second: 2 The sum is: 3.