Compilare: user.c: In function ‘main’: user.c:12:21: warning: comparison between pointer and integer [enabled by default] for(i=0;s[i]!=NULL&&j==0;i++) {if(s[i]==','||s[i]=='{') {i++;while(!((s[i]>='a' && s[i]<='z')||(s[i]>='A'&& s[i]<='Z')||(s[i]>='0'&&s[i]<='9'))&&s[i]!=NULL) {i++;if(s[i]==NULL){i=0;fgets(s,100,f);}} ^ user.c:12:158: warning: comparison between pointer and integer [enabled by default] for(i=0;s[i]!=NULL&&j==0;i++) {if(s[i]==','||s[i]=='{') {i++;while(!((s[i]>='a' && s[i]<='z')||(s[i]>='A'&& s[i]<='Z')||(s[i]>='0'&&s[i]<='9'))&&s[i]!=NULL) {i++;if(s[i]==NULL){i=0;fgets(s,100,f);}} ^ user.c:12:178: warning: comparison between pointer and integer [enabled by default] for(i=0;s[i]!=NULL&&j==0;i++) {if(s[i]==','||s[i]=='{') {i++;while(!((s[i]>='a' && s[i]<='z')||(s[i]>='A'&& s[i]<='Z')||(s[i]>='0'&&s[i]<='9'))&&s[i]!=NULL) {i++;if(s[i]==NULL){i=0;fgets(s,100,f);}} ^ user.c:13:58: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration] while(s[i]!='"'&&i<strlen(s)) {fprintf(g,"%c",s[i]);i++;}fprintf(g,","); ^ user.c:13:77: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] while(s[i]!='"'&&i<strlen(s)) {fprintf(g,"%c",s[i]);i++;}fprintf(g,","); ^ user.c:24:16: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] {for(i=0;i<strlen(s);i++) {if(s[i]==':') {i++;while(!((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')||(s[i]>='0'&&s[i]<='9')))i++; ^ user.c:9:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,100,f); ^ user.c:12:195: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] for(i=0;s[i]!=NULL&&j==0;i++) {if(s[i]==','||s[i]=='{') {i++;while(!((s[i]>='a' && s[i]<='z')||(s[i]>='A'&& s[i]<='Z')||(s[i]>='0'&&s[i]<='9'))&&s[i]!=NULL) {i++;if(s[i]==NULL){i=0;fgets(s,100,f);}} ^ user.c:21:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,100,f); ^ user.c:33:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,100,f);} ^