C Common Funcs

INPUT

• getchar() collects user input, reading a single character:

#include <stdio.h>

// Driver code
int main()
{
    int character;
    character = getchar();

    printf("The entered character is : %c", character);
    return 0;
}

• putchar() prints the single character:

#include <stdio.h>

// Driver code
int main()
{
    int character;
    printf("Enter any random character between a-z: ");
    character = getchar();

    printf("The entered character is : ");
    putchar(character);
    return 0;
}

• scanf() collects user input, type can be specified:

scanf("{varType}", &{varNameToStore})
//& represents the address of the variable
//varType should be replaced by representatives (e.g., %d)
//ONLY READS UP TO WHITESPACES

• fgets() collects user input, PAST whitespaces:

fgets({varNameToStore}, {byteSize}, stdin})

STRINGS

• strcmp() compares contents of strings:
  • strngcpm({string1},{string2})
• strlen() gets length of string:
  • strlen({string})
• sizeof() returns bite size of a var:
  • sizeof({var})
• strcat() adds a second string into the first passed:
  • strcat({str1}, {str2})
• strcpy() copies contents of first passed into second passed:
  • `strcpy({str1}, {str2})1