C Programming Code Examples
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C Program to Replace all the Characters by Lowercase
/* C Program to Replace all the Characters by Lowercase
1. Take a string as input and store it in the array string[].
2. Using strlwr function replace all the characters by lowercase. */
#include <stdio.h>
#include <string.h>
int main()
{
char string[1000];
printf("Input a string to convert to lower case\n");
gets(string);
printf("Input string in lower case: %s\n",strlwr(string));
return 0;
}
In C, the "main" function is treated the same as every function, it has a return type (and in some cases accepts inputs via parameters). The only difference is that the main function is "called" by the operating system when the user runs the program. Thus the main function is always the first code executed when a program starts. main() function is a user defined, body of the function is defined by the programmer or we can say main() is programmer/user implemented function, whose prototype is predefined in the compiler. Hence we can say that main() in c programming is user defined as well as predefined because it's prototype is predefined. main() is a system (compiler) declared function whose defined by the user, which is invoked automatically by the operating system when program is being executed.
Get string from stdin. Reads characters from the standard input (stdin) and stores them as a C string into str until a newline character or the end-of-file is reached. The newline character, if found, is not copied into str. A terminating null character is automatically appended after the characters copied to str. Notice that gets is quite different from fgets: not only gets uses stdin as source, but it does not include the ending newline character in the resulting string and does not allow to specify a maximum size for str (which can lead to buffer overflows).
Convert a string to lowercase. The strlwr() is string function defined in the string.h header file, which is used to convert all the characters in a String to lower case letters. Another commonly required string operation is that of converting the case of a given string. The C standard library does not provide any function for case conversion. However, some C implementations provide the strlwr and strupr functions. The strlwr function converts all characters in a given string to lowercase, whereas the strupr function converts all characters to uppercase.
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