7-7.c

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#include<stdio.h>
int letter,digit,space,others;
main()
{
	int count(char str[]);
	char text[80];
	printf("\n Input string:\n");
	gets(text);
	printf("string:");
	puts(text);
	letter=0;
	digit=0;
	space=0;
	others=0;
	count(text);
	printf("letter=%d,digit=%d,space=%d,others=%d\n",letter,digit,space,others);
}
int count(char str[])
{
	int i;
	for(i=0;str[i]!='\0';i++)
		if((str[i]>='a'&&str[i]<='z')||(str[i]>='A'&&str[i]<='Z'))
			letter++;
		else if((str[i]>='0'&&str[i]<='9'))
			digit++;
		else if(str[i]==' ')
			space++;
		else
			others++;
}