#include <stdio.h>
#include <string.h>
#define MAX 100
 
int main() {
    char string[MAX];
    printf("Digite uma string: ");
    scanf("%[^\n]s",string);
    int comp = strlen(string);
    printf("Comprimento de '%s': %d\n",string,comp);
 
    printf("Informe um caractere: ");
    char chave[2];
    scanf("%s",chave);
 
    if(!strstr(string, chave))
        printf("O caractere informado nao existe na string.\n");
    else
        printf("O caractere informado existe na string.\n");
 
    return 0;
}
 

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frase de teste
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